Free: Contests & Raffles.
I've owned numerous 4x4's over my life time and for good reasons. That said, my 02 Ford 4x4 SuperCrew is to date the Worse 4x4 I've ever owned.Ford's better "idea" was to make them so you have to take them back to a dealer for, what used to be simple maintenance you could do in your back yard.But that is true of all of them now.My best 4x4's were a 73 and 75(thats 1973)Chev 3/4 ton 4x4. My rig at present that I use in the hills, 92 Jeep.I don't think you'll get much "power" increase out of a 4.2 unless you have a "mechanic" to rebuild it and find a place that sell 110 octane gas.
Resist the temptation to mod this truck. It is what it is - a form of inexpensive, reliable transportation. Anything you do to it beyond a religious maintenance schedule is going to reduce its reliability and economy. If there's nothing wrong with it at all as is, don't go spending money making trouble for yourself with this rig.