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First,you should never use sealants on any feul related part. Gas can break them down, causing them to be ingested into the engine and create even more trouble, other than not sealing for very long at all. If the leak is happening at the carb mounting surface with a new paper gasket, that is an indication of a warped mating surface on either the carb or the manifold. Clean both mounting surfaces and check for warping with a flat surface, such as a metal ruler (side edge). I doubt that is the issue, especially since this is an updraft carb. Most fuel leaks from the carb area are caused by either a mis-adjusted float level or a leaky float needle valve or seat. If your baby is running good and doesn't leak while the engine is running, I would suggest you leave it be and get into the habbit of shutting the fuel off when not running, (a good idea anyway). If it's leaking with the engine running, it really should be addressed. My suggestion would be to remove the carb and connect it to your feul supply. Much easier to identify the problem area if your mounting suraces are not the issue. I hope this helps.
P.S. If mounting surface is warped, a machine shop can shave either the carb or the intake surface flat again a lot cheaper that replacement. Carb = $152 at TSC
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