Will they?
You have a bit of a loaded question. First lets talk about the wheels. First is the bolt pattern; they need to be a 4.75 bolt pattern and I'm not sure that it's the same on Pontiac. Then there's the backspacing. That's the distance from the inside hub mounting surface to the inner flange next to the tire bead. That can be an issue depending on disc brakes and/or drum clearance. All told, try 'em on. The springs have similar issues. What car, exactly were they made for, and with what equipment? Engine weights are a big factor in spring compression. The springs may be the same length, but will compress at different rates. An in-line 6 weighs more than a small block chev, but only a little less than a big block. I think the Trans Am came with some engine options, big and bigger, but also some handling packages, stiff and stiffer. Get some part numbers and do a search so you know what your getting. I don't remember exactly what I paid for my front springs, but it was around $100 new. Oh, then, when you put those new, correct springs in, you may find that the ball joints need some attention and you will need to realign the front end.
This sounds like a lot of research, and it is, but doing it before you buy the parts means your money will not be spent on parts that are sitting on a shelf. Like I have.....