Appreciate the thoughts. I am actually in Tennessee, so, no "harsh" winters here. And I would very rarely want or need to use the tractor in freezing weather. Probably never. As far as I can see (I was able to rotate the battery tray out to get a look), there are no glow plugs.
On the fluid changes, etc., I will before I return the tractor to use, but I'm thinking during the diagnostic period, I'm not going to fill the radiator with fresh coolant just to find out if it has a leak. I'm not going to change the oil before I determine if the block needs to be rebuilt. Just top off all the fluids until I get it operating, and then change out all the fluids for new.
One thing I need to get fixed first is cleaning the fuel tank. There is lots of sludge that I don't want to send through the fuel system.