The 6.2 is rather gutless but can be made to put out a few more ponies with a 6.5 turbo. Your trans will not work as teh internals are different from a gasser to a diesel. The 6.2 will get much better mileage adn will drink about anything you pour in the tank. I ran an IDI 7.3 on waste motor oil for years as a farm truck. I say go for it.