With the Incon kit, It doesn't take much!
Bolt on some good heads, intake, 65mm T/B, free flowing exhaust like Magnaflow, sub-frame connecters, some rear control arms, and a pair of slicks. You'll run 11's all day long. Then turn around and drive home, no problems.
Tom said for every pound of boost, you get approx 30hp
I ran 12.40 with a bone stock 112k long block. And stock means stock, cam and all. Found out later I had a blown head gasket, and a few other problems.
I'm building a 336 with ported Trick Flows, port RPM intake, stock cam w/1.7 roller rockers. We guess-a-mated around 650hp when all is said and done. My machinest thinks it will be more like 700hp. We'll see!