As far as rearends are concerned, I believe that the G.M. 8.5" ten bolt would be an excellent compromise. It looks stock. The 8.5" ten bolt replaced the 8.2" ten bolt in the 1971 mid-size G.M. cars. The twelve bolt rears contain a 8 and seven eigths inch ring gear, but the axles are about the same size and quality as the ten bolt. Most 12 bolt stuff (gears, axles, carriers, etc..)by John Hager - Pontiac GTO Forum
I have a Pontiac Tri-Power intake (casting #9775088 1) date J30 3 (October 30, 1963) with the two original end carbs (both # 7011997) which are unique because they do not have any adjusters or choke mechanisms. The original center carb has been replaced by another carburetor. It appears that the center carbs were much more readily available in their day, as they have the normal adjusters and chokby John Hager - Pontiac GTO Forum
I have a working 2 speed automatic transmission with the converter. I'm not certain about the year (might be a 68), but if you are interested I will check the numbers for you. $100.00 buys it. I'm located in New York State. Contact me by phone at 845-629-4781 or e-mail: f85racer@aol.com Thanks.by John Hager - Pontiac GTO Forum