Taken of the mike´s A fordable parts catalog!!
99% Of the time, the problem is not in the carb, but the gas line fitting that fits into the carb. Either the ferrule is damaged or the line is just not fitted correctly, causing the gas to leak out and run down around the carb. This in turn gives the impression that the carb is leaking at the gasket.
If your ferrule is leaking order a new line - A9240B or C - See Page ___.
Another major problem is the condition of the Shut Off Valve, so often they are the original, and are in need of replacement or repair. Check to make sure that both of these areas are carefully looked at before blaming your carb, and un-neccesarily starting a repair or rebuild job that could have been avoided.