Baffle has me baffled!

The quality of carb kits available through normal channels is much poorer than it used to be—including gaskets. Get worthy parts from thecarburetorshop.com . In the meantime, you might be able to get by with two of the crummy parts store carb kit gaskets. Inspect the bowl carefully for a warped or damaged sealing surface, and make sure there is not a single speck of old gasket remaining on the bowl or carb body.

Do not apply any kind of sealer, no matter how "gasoline resistant" it claims to be; that stands to make multiple kinds of problems, none of them fun.