The Stovebolt Site Forums The Parking Lot '60-'66 Trucks Carburetor...rebuild or replace?

The old towel trick can help on occasion as well. It's free and simple.
Get the revs up to about 2000-2500 or so.... then take a clean towel and choke off the top of the carb until the engine almost dies. Repeat a few times. See what happens. You may be surprised.