I'm building a 350 for my RS. It has forged flat tops with trick flow 23 degree aluminum heads 202/160 valves, and a stock corvette LT4 roller cam with 1.6 ratio roller rockers. It has 9.6:1 compression, Holley 670cfm TBI unit, and aftermarket intake manifold and fuel pump. L98 exaust manifolds, dual cats, and a flowmaster TPI cat-back system. I'm also in stalling a 150hp shot of NOS, but I need to know about how much horsepower this motor will put out naturally aspirated. (people who know engines only, not some 15 year old with a V6 car please) Thanks guys!!!