The carb in the link had the secondary air bleed channel drilled all the way through to the bottom of the main body and into the baseplate where the transfer slots are.
I don’t recall the 3310’s being that way(but they might be). That’s really the main thing I’d be looking at.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
