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If the two motors that are 2 phase have the same shaft diameter, you can just see which one works the best. There is a thread or two somewhere referencing the SFPM, but I don't know them. It would...

How many horse-power is that? I wouldn't recommend much smaller than 1 hp for a 2x72. I would slow it down with as small a pulley as you can on the motor and go a bit larger on the drive...