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I'm thinking if you are swapping a 6.2 or 6.5 diesel, you must be doing it for the novelty effect. Cummins conversions are very simple, you would have to drop some large coin to get the early GM diesels to preform anywhere close to a stock Cummins. If you are just looking for fuel mileage, stick a 4BT in there. They are getting mid 20mpg in half ton setups.Like I said earlier a Dmax conversion I could understand as they make good power, but are a much more complicated install. You can go to the 4BT Swaps page and read for weeks on conversions of all makes.