Folks, need some input and suggestions. Here is the setup. 71 Dart factory weight, 430 gears, 295/65/15's, 3000 convertor, 440 .30 over, quench pistons, 484 cam, 906 heads, M1, HEI ignition, I live at 5000 alt, raceway is 4000.
Right now I have a 750 vac secondary with Proform main body. 75 primaries and plate (would assume 70). Had 67 Jets, updated to 75. At about 4800 starts to fall flat like fuel issue. I have 7lbs fuel pressure through 1/2 p/u and 3/8 return. I dynoed the motor and 425 hp, pulled good no issues with mechanical 850 jetted 84/84. (Not my carb, was shop mule carb).
First, should I try to update my 750? with QF plate, secondary 78 jets and possibly spring changes for rate of opening?
I have been looking at the Holley 850 (http://www.summitracing.com/parts/hly-0-80804bk)
Or
QF: http://www.summitracing.com/parts/qft-bdq-850
Or do you have ideas, thoughts
Right now I have a 750 vac secondary with Proform main body. 75 primaries and plate (would assume 70). Had 67 Jets, updated to 75. At about 4800 starts to fall flat like fuel issue. I have 7lbs fuel pressure through 1/2 p/u and 3/8 return. I dynoed the motor and 425 hp, pulled good no issues with mechanical 850 jetted 84/84. (Not my carb, was shop mule carb).
First, should I try to update my 750? with QF plate, secondary 78 jets and possibly spring changes for rate of opening?
I have been looking at the Holley 850 (http://www.summitracing.com/parts/hly-0-80804bk)
Or
QF: http://www.summitracing.com/parts/qft-bdq-850
Or do you have ideas, thoughts