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

Rmoore said
Make sure you use some compressed air after soaking your carb ! Blowout every hole you see , from both ends of the passage ! You probably already know this , but just saying !

Yeah I did that when I rebuild it. Ran the same as before. Big difference was made when I replaced the bad vacuum plug.