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A deeper half bell may be for some other 8BA family application. Mercury used the same half bell from the 1949 intro through very early 1951 but they all used the same basic transmission. 337 Lincoln & truck are altogether different as well as Ford cars & commercials.
I'd figure it must be for an industrial application but I certainly don't know what that might be. I don't know of any other transmissions that match the Mercury stamped steel half bell mounting but have a longer intput shaft.