There is no V6 whatsoever that is going to bolt-up.
Your best bet if you want some more power is to swap in a 4.0 HO. Sure, there's better swaps, but all of those are going to cost significantly more and be much more work.
THE ONLY place you should get one from is:
https://wranglerfix.com
Not only is Mark a forum sponsor, but he's one of the best guys you'll ever do business with. Call him and you'll see!
This thing actually looks really good if you ask me!
https://www.ebay.com/itm/224920042926?mkcid=1&mkrid=711-53200-19255-0&siteid=0&customid=link&campid=5337789113&toolid=20001&mkevt=1
This is definitely one of the cleaner YJs I've seen!
https://www.ebay.com/itm/284610664609?mkcid=1&mkrid=711-53200-19255-0&siteid=0&customid=link&campid=5337789113&toolid=20001&mkevt=1