Moses,
OK, I've decided to just do a 4.0L swap into my 4.2L YJ. Since the YJ will essentially be a Daily Driver, I'm not going the 4.6L stroker option. After analysis, it is more economical to simply source a used 4.0L engine with EFI than it is to retrofit MPI onto the 4.2L engine. As you might have guessed, my research shows that XJ 4.0L engines are more plentiful and cheaper than trying to find a 91-95 YJ 4.0L.
My question: Can you point me towards any resources that show how to do an XJ 4.0L swap into a 4.2L YJ? I'm thinking a 92-95 XL engine (I have already found a 95 XL engine with harness, sensors, and computer for $450). I'll be doing a full rebuild on the 4.0L engine. I will also be swapping in AX15/NP231 gearing. I'm fairly comfortable on tackling the harness issue by using schematics. I will most likely change out my YJ fuel tank/sender with a tank that takes the appropriate in-tank pump/sender. I want to be sure I understand the issues with 1) engine mounts, 2) XJ 4.0L serpentine belt reconfiguration for mechanical fan, and 3) what else to be sure to grab when sourcing the engine beyond harness, sensors, computer, and 4) anything else.
Many thanks.
Juan Grande