9 times out of 10, the problem is the booster you have on the car, leaking, or not enough boost.
You are better off going to a 9" dual diaphragm booster if it's due to low vacuum from cam selection.
Vacuum pumps are problematic, and either don't provide enough boost or 'run out' before you're done needing vacuum. Not to mention most are loud, and vibrate a ton.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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