If you can't get a 9" dual diaphragm booster to work, then just go manual. Next option IMO is hydro boost.
None of the vacuum pumps I've seen or tried work acceptably. Same with others that I know who have tried to use them.
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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
https://forums.maxperformanceinc.com...ght=procharger
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