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What are your plans for the car? Is this going to be an "all original restoration?" A driving resto-mod? A drag racing or autocross car?

If you want original stuff, the original tires on that were either E78-14 or (when radial tires became available as an option in 1974) FR78-14 or E70-14 for the SS models or G78-14. I get conflicting information between those two sizes. The 225/70R14 is slightly larger diameter than the stock(ish) FR78-14 a G78-14. 215215/70R14 is closer, but there are more choices in the 225/70R14 size, and it those will probably fit without rubbing. There are reproduction tires (both bias ply and radials) available in the original G E78-14 size and FR78-14. 195/75R14, 205/75R14 and either 215/70R14 or 225/70R14 would be the closest sizes in modern radial tires. There are some choices available in those sizes.

There are certainly more choices available today in the 15" sizes, but those are small diameters for 15" tires. The stock sizes are around 26" diameter. The closest 15" size (which would be like a +1 upgrade on the original wheels/tires) is a 195/70R15, 205/70R15 or a 215/65R15. Both All of those sizes are fairly common, and were used on a lot of mid 1980s to early 1990s German sedans (many still on the road today), so there are a fair number of choices in those two sizes. Just watch out for the load rating and make sure you get something that will support the weight of your 1972 Nova when it's finished.

NOTE: Edits in red were made when more information became available. Thanks @CdnL79 Registry .
 

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Well, I was wrong then. That's one size smaller than I thought.

When the Novas got radials, did they increase by one size, like E78-14 to FR78-14 like most other GM platforms? Maybe that's where my sources got their slightly larger sizes.
 

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Sandblasting shouldn't be too much. Look around. A local guy here will do a set of 4 wheels for $40 or less.

Powdercoating wheels can be expensive, or not. Depends on who does the job.

For paint, check your FLAPS for "wheel paint." That will be less expensive than powder coating for certain. Expect 1 can of wheel paint will do 2 (maybe 3) wheels with several light coats. Don't be impatient. A few light coats is much better than one heavy coat with sags and runs.

For tires, the BFGs used to be great. Every set I've seen in the past 10 years, the letters turn brownish. They are also expensive compared to the other choices.

I'd run 215/70R14 on that car. That will make your speedometer read more accurate than what you have. With what you have now, your speedometer is reading lower than Officer Friendly's radar gun, and that can be a problem.

In that size, if you want to pay extra for raised white letters and probably the best "performance" tire available (in that size), look at the Cooper Cobras. IMO, today, those tires are way better than the BFGs. I run those on (the front wheels of) my S10 pickup truck now, in 215/70R15 and they are great tires IMO.

If budget is an issue, consider the Kumho Solus TA11s in 215/70R14. Also good tires. No white letters, but reasonable grip, and the tread life is better than the Coopers (and way better than the BFGs). Before I got the Cobras, I ran two sets of those on the S10 (on all 4 corners, plus the spare) and they were also great tires. Not quite as grippy as the Coopers, but way more grip than anything that was available 20+ years ago. Also, way better on the budget and they lasted longer. So those are very budget friendly.
 

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I always wanted the BFGs, but for my truck (i run 33x12.5 on 20s) it would be a fortune. Good to know the letters turn brown, maybe i will stay away for sure now. I was looking at Cooper Cobras. Tires are a long way down the road though. The more i look at this nova the more problems i find. Might be out of my league on this one!
Anyway, after doing some looking, my rears are 225/70/14 and the fronts are 195/75/14. Lets say i stay that size or go up/down, my question is: are the rims specific to the axel? Like can i put the rear rim on the front? Any weird backspacing i should know about? If i pull the rims, sandblast them, paint them, do i need to worry about front or back since there is no tire on them?
I can't answer those specific questions (the bolded part) for your car in its current condition.

When it left the factory, it had 4 identical wheels with 4 identical E78-14 tires installed on it. With this kind of "find," it's best to check all 4 tires. I've seen cars in this condition where every tire was unique (different manufacturer/model tire, and different sizes). I've seen lots of cars on the road with 3 different sizes on them (ones that drove in to my shop that way). I've also seen cars with 3 or 4 different wheel designs installed (different backspacing/offset, different widths).

You seem to be very aware of what to look for. The only way to know what you have on your car is to take the wheels off, lay a straight edge across the back of the rim and measure the backspacing. When you get the junk tires dismounted, you can measure the width of the rims as well. If your rear wheels are wider than the front wheels, you may want to stay with a "staggered" setup, with 70 series tires on the rear and 75 series on the front, or go to 70 series on the front and 60 series on the rear. If all 4 wheels are the same width and the same backspacing, I'd recommend going with identical tires on all 4 corners. "Staggered" setups with identical wheels look goofy IMO, and they can have weird handling issues sometimes.

Your speedometer is calibrated for ~790 revolutions per mile on the driven wheel, or about a 25.5" outer diameter tire. If you deviate from that, your speedometer will be off. Smaller outer diameter/more revs per mile is generally a better choice than larger. With larger tires, when "officer Friendly" asks if you know how fast you were going, your actual speed on his radar gun will be higher than the number on your speedometer. With smaller tires, the number on the radar gun will be lower than what you see on your speedometer. Everyone thinks "I'll know that, and drive accordingly." I used to think that, too. Until I forgot one day driving a vehicle I had oversized tires on, and I got caught going faster than I realized.
 
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