If you give up on this, let me know, I'm looking for a Comanche with blown engine so I can get parts from it, including 4wd for my '86 2.5L. I'm in Portland area. You might have a hard time finding a 2.5L engine, almost all of them around here are 4.0L; I was surprised to see your 2.5L post from Corvallis. I went to OSU, so I don't mind making a trip down there.
EDIT: Right after I said you would have a hard time finding a 2.5L, I saw this on Craigslist, no price though: http://portland.craigslist.org/wsc/pts/4321803477.html I'm going to see if he has 4x4 parts for me, he's parting out the truck.