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The Zj is going to be an automatic, are you going to use that transmission, or do you want to use the YJ's trans? The answer to this will determine if you need to mod the ECU for not using the stock trans which it controls.
Kind of an odd forum to ask this question <scratchs head>
Maybe the poster thinks this forum covers ZJs?
A Wrangler forum might be able to tell you more about swapping the MPI 4.0 into a YJ. IIRC the ZJ and WJ 4.0L blocks are different, and won't land on the 258 mounts like the XJ 4.0L will. A ZJ forum would know more about that, or maybe the JeepStrokers forum. The have a blocks faq https://www.jeepstrokers.com/forum/view ... ?f=34&t=52 and seem to know quite a lot about swapology.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.