Same size carb came on the 1st Gen z28 302. Nobody complained about it being too big.
Yours is probably setup wrong for your combo. Find someone that is good with holley carbs to tune it on the car instead of your rebuilder guessing on his workbench.
Bigger carb may need timing advance curve changes to work properly.
In theory, there is no difference between theory and practice. In practice, there is.
