Okaaay... first things first. What are you starting with, a V8 or slant 6 car? If it's originally a slant 6, you'll need a different transmission. It will NOT bolt up. If it's a 273/318 car, you will need to find an early style torque convertor in order to use your existing transmission (the early TCs are different from the '68 and later 904s and do not interchange). Then you will need a crankshaft hub register adapter to fit the nose of the early convertor into your late 318 crankshaft.
