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

Hey guys,

I haven't abandoned this thread or anything. Just got busy with life. Car's had a major oil leak (half quart overnight) for the past week and a half so I'm going to see what it is tomorrow. Been spending way too much on oil. Probably the oil pan but we'll see. I've read some other threads, but in summary:

1) get car on jack stands,
2) remove steering + idler arm ball joints from steering linkage center link
3) remove motor mount bolts
4) raise engine
5) remove oil pain and RTV the hell out of it

any pointers? I can't take the whole engine out, I rent a room and I don't think the o'reilly's guys would appreciate me pulling my engine in their parking lot. there aren't any shops that rent their bays either... there is a "neighborhood workshop" that is $200 monthly and requires an additional $100 course for use of their vehicle lifts, that require reservation, so not that. Any tips on this service? Thx.

Forgot to mention. The car will idle at 650-750 rpm with my foot on the pedal. Issue is that idle keeps changing. Me and a neighbor set it yesterday, and it's dying again. He says it's running super rich but I don't have any experience with that so I don't know.

Buying a vacuum gauge, engine crane and a bunch of other **** from harbor freight tmrw.

Thanks y'all for being so patient with this lol.