Leakage at the glass bowl generally was caused by a shrunk gasket, or someone using an aftermarket paper gasket.

If you have this issue, check your FLAPS and ask for a 1/8 inch thick sheet of rubberized cork gasket material, and cut your own gasket.

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop