You may need to go to a higher Vacuum power valve,say an 8.5,is your launch good? or does it stumble?I run 67/76's in my Holley 650 and it's just right.check for vacuum leaks also.
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Jack
1989 Mustang LX: Converted to Carb.650 AED Holley DP,Weiand Stealth Intake,Edelbrock Performer RPM Aluminum Heads,Hooker Super Comps, Ground Pounder Uppers and Lowers,Moroso Drag Springs,NEW COMP Xtreme Energy Cam and 1.6 RR. ,a few other goodies.*** New 1/4 times-12.50
1987 SC GT ( fast as hell)
2001 Powerstroke Tow Vehicle 1989 Coupe.
Sometimes when you cry,no one sees your tears..........
Sometimes when you are happy,no one sees your smile.........
But,FART just ONE time..........
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