I have a Cummins B33 that I am putting into Frankentruck. weighs in about 475 and currently has the fueling table up to about 130hp. The 4B is a good swap, however they do shake like a dog passing a peach pit just off idle. Both the 4B and B33 are metric engines as well as most modern engines that you will find. The VW 2 liter 4-pot or Audi/vanagon 2.5 liter 5-pot would both be a good engine, however you would have problems finding a transmission to bolt up, even though Kennedy makes an adapter. The Audi V10 TDI would be a nice engine, however they are pricey. GM has the 4.3 diesel that was in many cars in the mid 80's as well as the 5.7 liter diesl. The engines are so-so, however will work to be a good engine. The later Jeep Liberty's came with a VM Motori (italian) diesel.
