Originally Posted by vimnjicki
Maybe I'm just jaded by how much time and money I've put into the Dakota and I know I'm used to how heavy the Dakota is, even with the new motor but I am delightfully surprised at how nimble the Cherokee feels. I haven't checked the empty weight yet but it feels light and that is one thing that crosses my mind when i think of doubling the hp. Thanks again for the encouragement and your replies.
The one advantage the 4.0 in the ZJ has is low end torque.
You might be able to get the 5.9 in there, and I'd leave it 4x4 if at all you can, since it can come out of the hole faster.
Since you sound like you like playing around, you might also want to look up Monster Forged 5.0 upgrades to that straight 6.
Or, maybe just a 4.5-4.7 crank with or without overbore and a Hesco supercharger.
Check out the Hesco billet water pump... doubt it pumps better but it is way cool.