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

Haven’t yet, I don’t want to set my car on fire. Hard to do when it can barely maintain idle plus the choke doesn’t reset to cold position by itself, so I have to short the starter relay and set the idle in order to do any sort of troubleshooting in that regard. I’ll try later during a cold start.
Then use water in a spray bottle. "Haven't yet" probably "never will".