I was recently considering doing a 350 swap in my 95 yj, but the cost is really gonna get me so I've decided to put it off for a while. In the meantime, what's the best way to increase power to a 4cyl? Stupid question I know. It's just really annoying going uphill at 50mph in 4th with your foot to the floor trying to gain speed.
I just completed a electric fan conversion to my 4 cylinder. Getting rid of the heavy mechanical fan really takes a load off the motor. Great thing about the conversion, the electric fan work with whatever new engine you put in. Mine cost about $230. Included the fan, wiring and control module.
Not meaning to be a smart alack, but sell your existing rig and buy one with a 4.0. You may be surprised with the power and wind up ditching the engine swap, which will save you a lot of time and money.