another 383 build up Q

I'll be honest with you. I doubt that you'd be able to build a 383 to 600 hp and still keep it streetable on pump gas. I've built my 383 with ported heads,10 to 1 comp., high rise manifold, big 4 barrel, headers, and high lift cam in other words the works and on a chassis dyno the engine is calculated at 496 HP. I think if I was going to 600 shaft HP I'd be looking at a stroked 400 or go ballistic with a 440. Sorry, but that's my opinion.