idle?

76 Volare roadrunner 318, bbd carter 2 bbl, auto stock everything I figure Mileage reads 95,000, I guess 195,000. Have no idea it has ever been apart.
I can not get a constant idle anymore. Warmed up, ran great till recently. I did put a new fuel pump and filter on it. Warmed up, if I put it in gear the rpm drops from 8-900 to 400 and wants to die, Driving down the road, I slow down and it dies.
After warmed up, I noticed I can close the choke butterfly a little and the idle speeds way up. I cannot find any vacuum leaks, just a very slight one at the throttle shaft. I sprayed carb cleaner in the PCV valve.

I had a 318 once that the timing chain was plenty loose and would die at a stop sign. Timing would get out.
Is this a carb issue or what??