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pretty much you will need a parts vehicle. so that you can remove the engine, transmission, transfer case, axles, drive shafts, gas tank, computer, etc... everything.
and no the stock auto trans will not hold up to the power of a diesel, barely holds up to the gasoline engines
Here in Brazil I'm using the fuel gas gnt, the car loses a little power but is more economical, the heads are proplema this with my truck 180,000 miles and the price of gasoline worth
your best bet would be to get a wrecked cummins of a similar year but your trans will have to be changed, unless you have an nv4500 5 speed, but even still, its weaker than the diesel trans, puttinf the ford engine in would be a disaster, but anything can be done