Quick update:

The Super C carb bowl gasket will work with some modification.  All of the bolt holes and passage holes line up perfectly.  However, the venturi is larger than the hole in the gasket.  With a little trimming of the gasket, it will work perfectly.

Also, FYI, the sediment bowl gasket and screen for the super C will work on my Super 55.  Well, Case lists 2 different sediment bowl setups and two different carter carbs and the one with the similar Carter carb setup is the same.

AB, thanks for the links.  I will check all of them out as soon as I get a chance.