I'm currently working on a project to adapt a torque tube rear end to work with a Saginaw fully synchronized 3 speed transmission. No, it's not a Chevy rear end, so I won't get into details, but it looks like the same concept could be applied to a stovebolt. Having a 3 speed that doesn't have to come to a full stop to engage 1st. gear, without having to swap an entire driveline might be a good idea for someone who wants to keep most of the torque tube system intact while upgrading the transmission to a somewhat more modern setup. Since the Saginaw 4 speed shares a lot of parts, dimensions, and design features with the 3 speed, that's another possibility that might be worth exploring.
Jerry

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