I don't believe the 750 Holley is too small, but like others have said it may require tuning along with other components as it's probably a few things causing the issue. What are your jet sizes? What size exhaust do you have?
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1972 GTO
468 2 Bolt Main w/Eagle rotating assy
SD Ported 295 KRE D Ports 10.8 CR
OF Hydraulic roller w/ 1.65 stainless rockers
Performer RPM Intake
Holley 3310 780 Vacuum Secondary
TH400 with 10" Continental Convertor
8.2 BOP 4 pinion 10 Bolt with 3.36 gears
11.428/118.95/1.618
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