Trying to find fuel leak

The obvious would be to start the car and see if you can find a leak in the lines. Especially on the pressurized side of the fuel pump. If nothing still, you might have a stuck needle in the carb. Propaply dumping gas down the intake. You can usually see the excessive gas going Into the venturi when the car is running/fuel pump is on. After you shut it down, the pressure from the fuel pump forces even more gas into the intake. Hence the smell. Pull a plug and see if you are running crazy rich (black plugs) I had an old chevy with a worn out quadrajet that did the same thing to me.