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BB went onto large trucks for years, BB18 for 221, BB54 for 60, just BB in the early years with B engine. The serial is the ENGINE number, actually engine/trans assembly, and 4 speed truck units got the BB prefix regardless of what they went into. This sort of thing applied to all combos...for instance, in '39-42, a small number of special order Ford cars got Mercury 239 engines. These all got the 99 serial numbers that went with the power units.
Trans swap...just get a passenger trans with right clutch lever and rear mount for your year AND a Ujoint from a 3 speed.