My wrists are quite messed up so I will not be doing engine work for a while.  But here are some ideas.

Place the engine originally from the DYT4000 in the LT1000(2).  Remove the head check the bore again and set the valves with the flywheel mark.

The JD140's owner is talking like I can have the tractor.  It looks like Jack's has the piston and rod.  Needs to be 20 over.  Not sure if piston includes rings and need to check the crank etc.

See if I have a spare steering wheel to fit a JD.