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Borg Warner 1345 is supposed to have a wider chain than the 208.
The older 205 has no chain though, just gears, so it's even heavier duty. But it's cast iron and heavy.
And I also found out all these cases have different linkage setups and different overall lengths. If you are building something from scratch, that doesn't matter much. But if you are swapping, then linkage fitment problems and driveshaft length modifications come into play.