Not Ranked
Tim, you left out one detail that you included in your SCOF thread. The vacuum secondaries in your carb have the stiffest spring (black) that Holley makes. With these light cars, they need a mid pack spring at least, as they are so light.
Before you mess with anything else, get the mid tension spring and see what happens. Your symptoms are that of a car whose secondaries are not opening.
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Jim
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