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

Hey guys, it got worse.

Turns out the oil leak was from a cracked oil pan. One of the many previous owners put in a slant from a later car that rubbed against the K member and made it crack in the front and another in the back. Gonna need a new oil pan or dent in this one and get it welded. Fun fun fun.