I did this about a year ago with two xj's its not a a terrible swap if you have a complete donor vehicle. it took me about 35 hours to complete the whole thing i swaped the entire drive train and every wire from bumper to bumper, computer, fuel lines, gauge cluster, and radiators. it was well worth the power gain from the newer motor. th hardest thing i had to figure out was all the brake pedal switches for lights etc.... that was a 93-90 switch.