Electric Choke help

I'd start by disconnecting the choke rod at the carb. Move the choke plate fully closed [with a little throttle] and the fast idle should be on the highest step. Now move the choke heater rod in and out to verify that it can fully open and fully close the choke plate. Reconnect the choke rod and clip. Push throttle lever and open choke plate. The fast idle lever should drop. Release throttle lever. The choke plate should be ~1/4 from full open and the idle lever on first step or almost on first step.

Hit the throttle. The choke plate should slam shut. Start the car. The engine should kind of race. Hit the throttle again and the engine should idle down to 1200-1500 rpm and run smooth. If not, push the choke plate in either direction to smooth it out and then adjust the choke pull off rod with a narrow screwdriver or a pair of pliers. This shortens or lengthens the rod. Just a little at a time. The rod is the U shaped rod in pics 3 and 4. It may take a few mornings to get it right.

There is a fast idle speed screw and an idle speed screw. And an idle mixture screw. I believe you have a Holley 1920 carb.