If you do what I think you will end up doing, you are going to be close. I really like the '71 intake as far as OEM cast iron manifolds go. The '71 exhaust is a big issue with me (probably the reason I haven't put the originals back on my '71 Cuda '340).
As far as the heads, I think you can do some pretty trick work there but again, those damn manifolds are going to be restrictive. I know I have brought this up before ... and I know it's expensive ... and I know the gain isn't huge but there is always extrude honing. Maybe you can find a shop that will sponsor that (unless there is something in the rules re: sponsorship).