Thanks for that Lang, i think the engine you've mentioned perkins 6354 is the same motor as the perkins phazor which is used in dodge/renault 50s? You can pick up these dodge/renault 50s very cheap so this looks like the way forward. Have you any pics of the trucks you've mentioned so i can see how they've done this engine/box conversion with regards to mounting and coupling to the transfer box?
regards
ben.