68 H-code 'cuda - needs just about everything

Ok. I've got a second motor that addresses the problem of the un-tapped bosses. It already has them done. Special bonus: It's the right date code for my car! w00t! Thanks, hadahemi!

So. next question: Are the H-code A body exhaust manifolds the same as a B or C manifold? If there _is_ a difference, will they still work even if they're wrong?