Comp Cams XR280r thoughts to given combo
I'm not given to guessing what different combinations will make but I can speak from experience.
My combination was....
451
9.5:1 compression
"452" iron heads that flowed equal to or better than RPM heads
XR292R roller cam
950 4150 Quick Fuel DP
M1 single plane
588 lb-ft @ 4,600 rpm
621 hp @ 6100 rpm
It was easy to drive on the street with 4.89 gears.