A friend had one in a test mule truck he got from Chrysler-- the thing would pull all day long & never get hot. I heard they also used them to power APU for the Air Force years ago.
IMO it'd be fun to apply some modern technology to this old work horse & see just how much more power& endurance you could pull out of this thing.
BTW, what's 1 of these things (in rebuildable condition) worth?