OOTB Stealth vs Prepped Stealth?

The first 451 we built was 9.5:1 compression with 452 iron heads flowing 290 cfm. With a 950 cfm Quick Fuel, M1 single plane and a Comp Cams XR292R solid street roller it made 588 lb-ft @ 4,600 rpm and 621 hp @ 6,100 rpm. That was 2.14 hp/cfm