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The problem is the 855 CI block (which this most assuredly is) won't fit under the hood of either the M39 or 800-series trucks...too tall. I've seen it done, looks really odd with a channel cut into the hood. The same problem exists when putting a Jake brake on the Cummins 250. dg

Pistons. Piston cooling nozzles. Radiator capacity. Timing. Turbo. Injectors. Fuel pump. Air cleaner capacity. All are different between G742 and G744 engines. A number of dueces inherit 5-ton multifuel engines, with marginally better performance. The main problems are overheating...

As a general rule, N/A Diesels don't turbo well in terms of cost return other than emissions work. Similar engines with really efficient turbochargers are designed that way from the initial day. Sure, you can tag a puffer on anything and run it. Rodders do it all the time, but they are not...