I know nothing about antique grain mills. That said, that is a very cool piece of industrial hardware. From the looks of it, power shouldn't be an issue!
Have you plugged it in, tossed some (a little) grain in the hopper and turned it on? I would be too curious not to. If so, what happened? Not that I'm about to offer you intelligent advice whether you have or not. . .
Looks like it will be fun to fiddle with. Congrats!