Update:
Kohler points set did the trick. Plenty of room to adjust the timing properly.
Got the mule drive all put together, cleaned the rust off all the pulleys on it and the deck. Today was the first day I've actually been able to work the 1250 as it was meant to. It vibrates considerably because the mounts need replaced and the driveline attachments are probably worn, but I mowed for a solid 45 minutes and it did pretty well. Engine has decent power and the 44a's cut isn't bad either. Kind of amazing that it performed like it did with all of the neglect it's seen over the past two decades.
Lots of little things that need attention that I'll be documenting as I fix, but for now I feel like it is strong enough to call it a functional tractor.
The first issue I'm going to address is that the PTO clutch does not disengage anymore. Will remove and inspect bearings and air gap.
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