I've got a 400 SBC with what looks like a stock bottom end. I'm looking to pep it up a little bit. Right now its got what sounds like a mild cam, Weiand manifold, shorty headers and a 750 Holley on it. Bought it used so exact specs are unknown. What ever, its too mild. I'm thinking of stuffing a few turbos on it, maybe some better heads, and so on. Any ideas on what sort of abuse the short block might take? I'd like to coax 600 hp or so out of it, but I'd hate to grenade it right away. I figure 600 hp will be fast enough to make things interesting, but maybe not explosive. Any suggestions for other mods or guesstimates on what the short block might take would be appreciated--Thanks!