I will know later today when I get back to it if I fixed it. I removed all the copper plugs and restrictor on the idle circuit and cleaned the heck out of it. My small sandblast cabinet is filled with worn out glass beads
( mostly powder ) so I gave each bore a real good cleaning then followed up with air, strong soap, more air, and finally pipe cleaners just to be sure.
The restrictor is a very small brass plug with a .030" hole, or smaller, in the upper crosser over. I can see where it wouldn't take much to plug it up and keep the idle screw from working.

I am waiting on paint to dry so I can assemble the carb and put it back on.

I am sure the float is set right, both carbs have been check so many times now just trying to find the problem. It was dribbling fuel down the throat because the throttle was open to far, it had to be just to get it to run. It can idle on one carb, but very poorly. These are mounted to a 250 engine with a rough idle cam which makes tuning even worse. If both mixture screw do as they are suppose to, it will idle down work correctly.

I will update later,
Joe