I had a good look at a KM tractor unit with a 6V71 over the weekend. It is a very different beast from a TK. I didn't have a tape handy but I'm pretty certain it is a wider chassis and the V6 is still a tight fit with the exhaust manifolds hanging over the chassis rails. The engine is mounted further back because its width means that it won't fit into the front part of the bay which narrows in the section next to the driver.
Looks like a 500 turbo or maybe a modern turbocharged six such as an Isuzu 6BD1T might be the answer.
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