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Discussion Starter #1
So we have ripped out our old 307 and were attempting to drop in the new 350 we bought, but we ran into some technical difficulties. We plan to drop in this new 350 with our 1968 muncie four speed in a 68 Nova. We are not completley aware of the year this 350 block was produced. I have attempted to research the casting numbers (3970010, V02038WK, A118) <-- those being all numbers found on the block but with no straight forward answer.

Anyways, we went to attach the bellhousing and clutch assembly, but ran into a few issues that maybe someone will be able to guess a date for the motor, and what we should do...

#1 we went to attach the bellhousing but the 68 bellhousing from the 307 had a 6 bolt pattern, where the block as a 7 bolt pattern...

#2 The starter on the new block has offset bolt holes and did not fit into the 68 bellhousing. When you put the starter through the opening the holes would not line up, and if you lined the holes up the fly wheel was too small and would not reach the starter.

#3 We had a bigger flywheel that came with the engine block, but it is too big for the 68's bellhousing. And again the starter will still not fit in the bellhousing and line up with the holes

I found a guy who is selling a bellhousing that will fit up to an 85 block, but im still unsure if this will fit. I really wish I could figure out the specific year of this damn block so this would be a lot easier. Any help would be awesome and I apologize if this is difficult to comprehend. Im frustrated, I have a car now that is immobilized, and its late haha, But I guess that is what makes everything fun in the end right.... We will see
 

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Check out mortec.com for info on the casting numbers. Basically "010" blocks are 350's from 69 on up. Some two bolt alot are 4 bolt blocks. There are other numbers that tell ya when the block was cast on what day and month and year, and the ID number on the front pass pad is what car it went into. Sounds like its a 69- up large journal 350 that had a 168 tooth flexplate. Your 307 sounded like it had a 153 tooth flywheel. You can get a 153 tooth flywheel so your bellhousing will work. Also the 350 block has holes drilled for stagged mount and straight across mount starters. So the 307 starter should work as long as you have the right tooth flywheel.(I'm guessing the flywheel off the 307 doesn't fit?)

All chevy bellhousings are 6 bolt pattern. 4 on the sides and 2 up near the top. The one in at the very top center isn't needed. If not I'm sure you can find a 350 manual bellhousing and all the right components.


P.S. where did you buy the engine from?
 

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If you've got an 010 block then thats about as standard a small block as you will find. Used for alot of years, I think from 69 to late 70's. 403 & 621 bell housings will bolt right up.
 

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Discussion Starter #4
Thank you guys a lot I didnt notice that there were holes drilled for both the staggered and straight starters. Now im just going to go buy a straight bolted starter and use everything I have. We bought the motor from this guy who owns a race boat shop. It was in a 70's flat bottom race boat, but the motor originally came out of a car. He was unaware of the car but said it came out of a corvette. Thank you guys I think now we can continue to drop it in this weekend
 
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