It has been done... But backwards of what you're doing. A dude OBD2'd a 1993 to run a OBD2 5.9 out of a 1998 LTD. It took him a little over a year to complete, but he did it. Everything down to the over head console and VIC was swapped.
March 2014 GCOTM. 1998 Deep Slate 5.9
On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint.
In the garage: M1 4bbl
In the works: Addco/Hellwig sway bars, nitrous, full polly bushings, full exhaust, data logging, billet UD pulleys