Don’t take this the wrong way........
When supplying a set of heads and cam for a proposed 500hp 318 becomes a regular paying job...... then I’ll get interested in it.
As of yet, in 30 years of doing this, that is not a request I’ve ever had.
It’s usually more like “I want a 500hp small block street motor”...... to which I reply....... “your best bet is probably a stroker”.
And since I don’t do complete motors anymore, they get to continue that conversation with whoever they decide to have build it.