Parts are readily available from NH as well as a variety of other sources, some more questionable than others.
The block can easily be repaired by sleeving. Buy new pistons. Replace the injector nozzles (have serviced by competent diesel injection shop). Have the head checked for flatness and the valves ground/replaced as necessary... and observe the specs for recession closely.
THe crank... can mabey be ground enough to repair it. I'd make a point of pricing a new crank first tho. Along with a full gasket set, a new oil pump and a new water pump that will about cover it. If you want you can also have the injection pump serviced/cleaned.
If that's all adding up to more than you want to put into it... I'd suggest you call Alexander's tractor parts in Texas. They're the main regional Ford wrecker in your area. They can probably fix you up with a good running engine that will fit. Any Ford 3 cylinder Basildon engine will bolt in there. You may find some odd complications with linkages, intake and exhaust depending on what size or vintage of engine you get tho.