So my Perentie Ambulance has a cracked block. I bought an upgraded version, the Isuzu 4BD1T and asked British Rover Repair in Atlanta to install it. They can't seem to make it work even though its a common conversion in Australia. So I'm stuck. Getting another 4BD1 from Australia is an option, but those engines are in high demand and not really available. And apparently no one has a spare 4BD1 in the USA . So what about upgrading to another diesel. Any recommendations?