Yes I have swapped out the little Cat 3126 for a ISC cummins. But I'm a highly experianced heavy equipment mechanic. If You do it you will have to have the engine wiring harness and ECM from the donar. And be able to get the complete wiring diagram for the truck. The engine wiring diagram is real easy to get. Trucks not so much. The good news is the Cummins ISC 8.3L was used in some freightliner FL70 trucks so finding a adaptor harness to go from the Cummins engine to the Freightliner chassis should be able to located. And that would make the job way easier
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