I'm definitely keeping my eyes out for a small 4 cylinder Toyota diesel or one of the VM Motori engines that was in the newest Jeeps, or a small Isuzu diesel... I think a 4BT is just too much motor for a light truck... Maybe, just maybe a 3.3 QSB, but they only make ~100 hp, and are expensive as all get out... I'm starting a savings account just so that if I found a suitable engine I'll have the money to pick it up for a swap someday... I know the Isuzu Trooper came with a small diesel and you can't go wrong with an Isuzu diesel... I also think a Toyota B-series engine would be a nice one (~120hp/~220ft.lbs I think)...