Uremco’s Holley 1920. Just don’t do it.

First of all many times (most?) leaking carbs are NOT THE CARB

Dirt in the system getting "caught" (imbedded) in the neoprene needle/ seat and causing leakage. "Bowl vent" is the big trigger, means needle/ seat is leaking BAD

This can of course be

Leaking brass float or "gas logged" cork / other float
misadjusted float level
worn/ bad needle/ seat or missing parts or improperly installed
bent float arm dragging on internal parts of the carb