I'm thinking with that volume of leakage the problem has to be the float valve. It's either deteriorated or there's some debris in there preventing it from sealing and therefore allowing a siphon from the fuel tank. The carb needs to be removed and dismantled to get to the valve.
The visible area of leakage is where the fuel found a way out of the carb.
edit: Art beat me to the punch
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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