air flow research heads, call the company, they will be able to get you the best setup for what you want to use it for. prolly AFR225's
your pistons and crank are plenty strong dont waste the money there, i know a guy running a 100 shot and i think 17psi turbocharged in stock block.
fast intake (port it for max performance) and SLP 90mm throttle body, ls7 lifters and pushrods
for a cam, i would use a "257/266 646/622 110" from howards cam.
beehive dual springs
and put studs in the heads/mains/rods.
that would be about 550ish h.p.