AVS problems
Like I said, I'm not great with carbs. Least of all, Carter AVS. I'm looking for a direction to go with this.
As RRR said, it very well could be just a choke adjustment, because carbureted engines need a bit of extra fuel and even some raising of the idle till they warm up some.
A computer handles this on EFI engines, and the choke handles it on carbed.
Most electric chokes are adjustable, and some are adjusted by loosening the screws that hold the round bi mental section in place and twisting it a little to put more tension on the choke plate so it closes a little more on cold startup, as well as gets the linkage up on the high idle.
Once adjusted correctly you should be able to get in the car, put the throttle to the floor one or twice and it should fire right up on high idle.
Wait a couple of seconds, tap the throttle lightly and it should idle down close to it's normal warm idle.
Of course this changes with weather temps unlike EFI engines and may need a little tweak every season change form summer to winter then winter to summer.
