1920 Holley carb question

The carb was rebuilt twice so far and no change in the initial problem, which is it stalls when waiting for the light to change.

The idol screw doesn't change the idle speed even though it is being turned, and I was also told that when you hit the gas (ie. when the light changes), there is supposed to be a little "extra" gas to get the car moving, and whatever connection that makes it do that is fryed. Cannot be replaced by a rebuild.

I know nothing of carb rebuilding, so therefore I can't tell you if it is bullshit that the guy was telling me. At this point I just want to find another carb that is already rebuilt and ready to slap on the car with minor tuning.

Would you have any?