The "202 Fuelie" heads, or "double hump" heads as they are also called [b]are[/b] good....[b]BUT[/b] they are basically "old" tech.
If money is not a big object...there are aftermarket, light weight aluminum heads that will suit the purpose [b]much[/b] better.
Lighter, better flow, better combustion chamber designs.
Does CC chamber size matter on chevy? He's buying new pistons, so he should be able to compensate for a large chamber.
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Yes, chamber size matters on ANY engine.
Big open chambered heads are generally well suited for motors that will be running a supercharger...and for low octane gas.
Keep in mind that the formula for horsepower is [b]NOT[/b] simply: "HUGE CARB + HUGE MANIFOLD + HUGE CAMSHAFT + HUGE HEADS + HUGE EXHAUST = MAXIMUM POWER".
The parts must all be "matched".
[b]I would suggest contacting a place like JEGS, and having them put together a "carb/manifold/camshaft/heads/pistons" package for you, based on the horsepower/torque you want to make.[/b]
400hp is not too hard to get out of a 350 mouse...but you gotta combine the right parts.
[b]edited to add[/b]: I have a motor sitting in my shed that I pulled out of a 70 something Caprice...it has 202 heads on it...but a TWO BARREL carb.