Maximum Performance N/A 383 build. Input wanted from engine gurus.

fishmens67 said
Need more cylinder head than these to make power at 7500 rpm and beyond.
Realistically 6500 would be the limit with the parts listed.
also looking at 4.56 gear ratio instead of 4.10

I would be fine with 6500-7k but I m going off of what I was told by cam companies.

I don't really know cam voodoo all that well