Chassis (frame), pivot & transfer case parts can still be purchased from Big Tractor Parts.
Agree woth Chris as well - 86 much better tractor.
DT-466I is stretched pretty tight, careful maintenance and a close watch on the bottom end is necessary to avoid unexpected exiting of connecting rods through crankcase.
Good thing is there isn't enough HP there that the rest of the tractor can damage itself easily.
By today's standards they are very crude and loud, resale value will be minimal.
Open center hydraulics, 3pt hitch was optional and there is no PTO.