[Ed Wright]

Jim, I didn't build them for race cars. Just overhauls for people's work cars. The base didn't touch those in the problem carbs. I used modeling clay to measure the space in there, and found some thin rubber to cut pads from. Put those in all my rebuilds. Devon epoxy & those pads took care of them. I did that work for 40 years. Many customers were with me the whole time.
It was an easy test. If the idle adjustment screws had to be all the way in to get the C.O. (Sun 4 Gas Infrared exhaust analyzer) close to where it belonged, those were leaking. Just like Holley power valves or QJet metering well plugs.