Need to verify the throttles are opening 100% & adjust the carb: idle stops, idle mixture, fuel bowl levels, etc. May even need leaner jets.
Holley sells a book written by Mike Urich that is excellent for guidance in tuning the carb.
Holleys are very adjustable, and once it is adjusted for your engine, you'll be very pleased.
Then, there's the ignition settings ...
Happy New Year
George
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