[redmodelt]

RE "I always drain the gas by removing the carb drain plug, and it dribbles out a good rate."
It should run out not dribble even when just draining the carb. You may have the ferrule too far back on the inline at the carb. The line should stick out from the ferrule just about 1/16" of an inch. Also did you replace the screen at the inlet? It could be plugged too. Gas can run out the back of the carb when you over choke it, that is normal. Does not mean the float is bad or miss set. Now if it runs out by itself while the car is just sitting, that is different. With the fuel line disconnected from the carb, how is the flow then? It should be a strong steady flow, if not you have blockage up stream.