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

I’ll try that and let you guys know how it goes. Weirdly, after turning up the idle to 1250, it fell back down to 1000 after a day of sitting. I really don’t know. But I’ll disassemble and soak in some carb cleaner.
Make sure you put a new carburetor kit in it or you will be taking it back apart after you soak it