following Gregs thoughts, If the the Stage V cast iron is legal it is an open chamber but can be milled to nearly a closed chamber (or use a quench step piston) and the ports have a bit higher roof and a better short turn so (in the right hands) with a 2.19" intake valve they probably have a bit more flow potential than a 915/906/452, mildly ported (se the tech archives) they flow a little better than OOTB edelbrocks, so going full tilt they could possibly flow in the 300+ range with less work/$$$ than a 40 yr old production casting.

Take some hints from the FAST guys, there's a few mid-high 11 cars running production manifolds, I don't know if they still police idle vaccuum but I'd go agressive on the lobe profiles and put the duration, centers and ICL where you need them to get the idle vac. A dual plane like the big indy will give you as much or more flow than you need (more potential than the RPM) and will naturally pull more idle vac than a single plane.

The heads must have production casting numbers. Does anyone know if the stage V have production casting numbers???? I can't find any info on this. I was thinking the indy dual plane was max wedge port???

Answered my question bout the indy intake. It is standard port. Still havent found anything on the stage V having casting numbers or not.

So I'm back with more ideas! Please give your input on this combo.
470 400 block 33 over
3.91 stroke
6.700 rod
Ross 14cc dome comp 13.5
518 max wedge heads
1.6 rockers
Cam 245/251 @50
570/576 110 lsa
Indy 400-2 4150 intake

I would go with the comp pro magnum lifters, they are designed to act like a solid- giving you more rpm capability.
Too bad you're far from here, my brother and I were talking about selling his 63 max heads, they made 750 horse, ran low 9s-8? in a tube daytona.
The ports on them make my -1 ports look like 516s.
And, IIRC, they have 64 cc chambers