Suggestions for new design Aluminum Mopar SB clean slate (kind of) cylinder heads

There would be no reason for a custom or non factory intake or headers. Not sure why you keep repeating that. For rocker gear, even if the head were to stick with chevy rockers offset intakes are availible up to .775 and in a shaft form. All this does not have to equal an indy and can come in at half the price.

your right. I missread that. Now that I see what is requested, it’s sounds like what’s needed is a nicely CNC’ed Chinese knockoff, of which there is no lack of options.
he could buy blanks and develope his own deal like Bloomer did. Those heads have made verifiable 650 horse already without offset.
So 500 or better isn’t asking for a bunch.