Ron, this is an alternative, I did this cause it was cheap and it works great.
If you get the mounts off a 2.8 v6 jeep cherokee, you can bolt a 2.8,3.1 or 3.4 in the wrangler. A good bit more power than the 4 cylinder.
Everyone hates the 2.8, but its cheap and easy to work on. 3.4 camaro motor is cool, but more cash than I had for running around.
PM me if you need help, I rarely check in this forum, but its raining today.