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

Also, the early a body pans are not the only pans with no number and they all pretty much have the sump in the center, except the truck, so be very careful when looking for one, because there's only one that will fit.
Does this look right to you?

BB4DD2E8-CCC9-457A-BE29-4B4D6B289F29.jpeg