[Curt C.]

Car peaks at about 5900 for HP and 4800 for torque. I should also mention that the hp stays pretty flat all the way out to 6500. Around 9.8:1 compression. Again, how much power do you want? To achieve a power level simillar to mine, no question - upgrade. You have decent heads already. Tell us more about the cam, carb, intake and exhaust. Cams, and intakes are cheap and hold lots of power. Oh, yes, I have a fairly nasty lope.