tbh i dont think you will get 500 bhp and 500lbft unless your gonna run stupid boost
id go t4 hydralics, ported head, cams, 6stud, and wrc gasket this will give you a nice reliabe 500 bhp with 32 psi so not ringing its neck
and i also dnt think it will be ultra responsive but the ballbearing t4 isnt tooo bad