Ace...I was in charge of the beer supply and picture taking on the Frankenbonne project.
Biggest hurdle on your 89 is probably to check and see if you have threaded holes for the torque axis motor mount on the passenger side of your car. They would be on the body, roughly around the area of the overflow tank. If you have that..I'd say it'* very easy with all the info Randman assembled for Franken. If you don't..then you would need to have the holes/threaded inserts added in the precise location for proper alignment of the driveline.
Either way.. IT'* DOABLE!!!!!!!