I'm having an issue where my engine under load wot won't spin over 4400rpm. It's done this with two different cams. (The first cam had some lobes that were starting to go flat ) I've messed with the carb and ignition timing with no change. I'm running a efi converted to carb 460 (not ideal but it's what I had), .030 over, 9.3:1 cr, high volume ford racing oil pump, comp cam 34-235-4 w/ matching springs, comp roller rockers, minor port and Polish on heads, intake has been opened up, holley 750 w/ vac secondaries, and full msd setup( 6a box, billet diz w/ vac adv, large rotor cap, and plug wires). Not sure where to look next. Any ideas would be greatly appreciated.