1966 Plymouth Valiant /6 & Holley 1945 carb can only get to idle at 1250rpm. How to get a lower idle without dying?

RustyRatRod said
That bolts to the exhaust passage for the smog pump in the head. It should not have a breather on it. It should be blocked off. That could be a lot of your problem right there.

Blocked off the port, no change. I’ll hit search for the vac leak tmrw with carb cleaner.