Cruise Seems Lean

512Stroker said
#1 is a blank hole that holley did not drill and tap for an idle mixture screw
#2 may have been for ported vacuum but I am not sure?
Normally ported or timed vacuum are drilled in above the butterflies and non ported full manifold vacuum are drilled in below the butterflies.

#1 is definitely drilled in both carbs and has a vacuum hose nipple screwed in mine (pic above was NOT my carb/s)

#2 is tapped to a depth of ~ 0.5-0.625" but it appears is deadheaded at the end.

These are my actual carbs.