[427sharpe]

Gears. What differential are you running? a 4 OR 5 speed? What
tire size? All these things affect 'launch', and the CJ heads need rpm to develop power. A big improvement can be made in the CJ/SCJ heads by raising the floor of the exhaust port to improve flow at low rpm. Leaving the engine in the car, a gearset will give you the best bang for the buck difference in feel..just dont go crazy and end up turning 4000 rpm at 60! Also, please explain what you mean by 'hi range'...I presume you mean that the motor is not developing enough power in the upper rpm ranges? If so, check to make sure that your air cleaner is not choking the motor at this range....a common mistake in a Cobra. Also, check to make sure that the motor is getting enough fuel. The last 750
cfm I got from Holley had 62 jets (!) in the primary and 64's in the 2ndary. These are too small for a hi rpm big block.