How do you build a 500 horsepower 350 Chevy?

easy...sell it and buy a 454...then spend ur money there

or you could take out the crank put in a 355 c.i.d. forged crank,4 bolt mains, balnced rotating assembly, apr main studs, edelbrockheads-ported magnum roller rockers, victor jr intake -match to heads holley hp 750 holley fuel pump and of course supercharge it