From reading that, it seems like you'd be spending over 6 grand just to make around the same amount of hp as the 3.6 does. So unless you are super invested in your current Jeep, I don't see that expense being worth it. Might as well sell yours and put that extra 6k towards a newer one. Or, if you want to keep yours, put the money towards a V8 engine swap.
I just personally couldn't see spending so much for so little.