If the engine in the 90 is still running strong and its a good engine, i would not swap it. What i would do, is get the engine, harness, and computer and hold on to them. I would look at rebuilding that engine or stroking it for a future mod. BUT, do not do it if you do not think you will ever do it AND/OR you do not have space for it. You could always sell it or bring it to a local junk yard and get some credit for it or for a later purchase?
I would get as many usable items off of the Heep and sell the parts. The engine, tranny, axles, transfer case, etc, etc.... Everyone always needs parts.