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 installing 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!!!

 

which intake?

 

The holley 300-66 or the edelbrock Perfomer TBI

 

I recommend going with a larger intake. Go with the victor jr single plane since you're keeping TBI. If you think you might go to carb in the future than use a dual plane like the RPM. The performer intake is great for the 305 and a super mild 350 but anything more and it becomes the bottle neck in top end.
Ask NJSpeeder or someone else to do the horsepower calculations with desktopdyno.

 

on a nice engine like that I'd look into going with a multi port fuel injection with maybe an LT1 '94-'95 computer but its your call.

 

Well I have been building my motor up as well, a 350 TBI in fact, I have a holley TBI manifold and I am looking at getting a 670cfm TBI as well in a month or two. Horsepower wise hmm....it would be safe to say that maybe you'd be looking at at the least 350HP, at the least. Try one of those Gtech things or desktop dyno for the computer that will be the best way to see what kind of power you are looking at. Hope this helps