Thermoquad question

Vacuum advance should be plugged into the ported vacuum port which is above the throttle blades. I know guys that claim it works plugged into manifold vacuum but IMO it'll never work good that way because the lower curb idle vacuum can let the vac advance drop out then as soon as you touch the throttle the vac comes up and it pulls back in causing an erratic idle. The change in timing can actually change the fuel mixture requirements also further complicating the problem.

BTW: I've rebuilt several TQ's over the yrs. and every one I've seen also have bowl vents that stick straight up into the air cleaner just like nearly every other carb so I don't see why it'd be a problem just capping the emissions bowl vent off. Anybody here tried that?