"*Stock internals will simply not hold up to more then 18psi without replacing the pistons, rods, valve springs and everything else with Titanium...lots and lots of Titanium"
Where in the hell did you get this info? Many, Many Zs with stock longblocks have put down over 500 rwhp at over 20 psi. Zo did over 590 rwhp on a stock longblock and upgraded valve springs.