There should be a gasket. If it is leaking you should be hearing a bunch of exhaust noise.
I get sludge that dribbles from my carb onto my intake. I think the gas leaks out slowly and evaporates leaving a residue that dribbles down.
Bob- I haven't noticed exhaust noise. The next time I fire the car up, I'll be sure to take a closer look to see if I am getting anything dribbling down from the carb.
