The factory service manual will list ALL of the correct Pontiac part numbers for the cam, distributor, carburetor, etc. With that, along with a few other web sites, we should be able to steer you in the right direction on all the other external parts, such as correct heads, intake manifold, exhaust manifolds, etc. Most of the other internal stuff, such as the rods, pistons and cranks, are all basically the same for all 400 engines, except Ram Air 4.
When you say the "specs" on your engine, what is it exactly that you are looking for.
