Here in CA, I haven't ever paid more than $350 for a used 22r/e. If you through in the ecu and wiring harness, maybe list it for $6-700. If you aren't in hurry to sell it, you could list it for more and see if you get any takers. It would be easier to sell it for more if you leave it in the truck so perspective buyers can hear the engine run and drive the truck.

If it were me(and will be as soon as I come across a '91 7m w/harness), I would look for a Toyota 4x4 or 2x4 with a bad engine for around $500, something like this 1990 Toyota pickup $500 (Pocatello), or this 1987 Toyota 4X4 Pickup, swap your good motor into it, and make some extra cash.