I have actually been wondering about that also. I can't see why it wouldn't work, but at the same rate I'm not quite ready to jump off that bridge without a little research either.
It should fit up to the motor no problem... I would imagine. Its basically the same motor as the 94-98 (fuel pump being the main difference). The issue I've heard, is more so with the master brake cylinder on the 1st gen trucks. You asked "motor", so I have to ask, is this going on an 89-93 motor that you're putting into another truck?