Problem with Holley 4 bbl

Daves69 said
Find someone with a known good carb you can test your Holley against?

Lol, can't or don't want to. (Just kidding) Could you possibly be pulling air from an internal heat crossover leak?

Well, the intake is a Holley Street Dominator so there is no heat crossover passage. However, it does have an EGR mounting pad but I've checked that for leaks.