Repower with A2300T Cummins?. 2.3L turbo. One Company does fit kits http://www.powerupfit.com/html/products.php?id=products

My 86 Trooper C223T does ok but after 225k miles, It leaves enough smoke behind upon acceleration that it isn't making any converts for passenger diesels. Fine on the open road though. I dream about a new engine, not a rebuilt.