There's a 69' Corvair with a stock lq9 bottom end, ls6 inatke and a cam making 617 to the wheels! Granted it's running a D1SC but I talked to tech at Procharger and he said at the boost level I want ( 8 - 12 ) I won't see much of a difference (just a bit more mid range) going from a P1SC to a D1SC so I found out I have no reason to spend $1500 for a upgrade!
here's the link below if anyone's interested. Doesn't say PSI level but I'm guessing below 11...
http://www.dragzine.com/features/car...air-of-chevys/