10.35:1 compression with 452 or 906 heads is a pretty loopy idea.
This cam is to be mild with a lope? Sounds like a Thumpr or a Whiplash Cam. Both of those are a very bad idea with 10.35 compression. More information please.
Neither head stock will have a significantly different head flow or power potential but they are quite different in design and the 906 has way more flow when ported correctly.
