Mystery - Strong Fuel Smell

I was wondering about the carb. Are you running rich? It looks bigger than a stock carb. About 8 years ago I put a 750 carb on my modified 340. Every time I drove it I smelled like gas, the car smelled like gas, and the garage smelled like gas, but there were no leaks. I jetted the primaries down 2 notches, and that problem went away.