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I don't know how they did that but isn't the 7.1L DMAX an inline 6 found in their commercial set ups? This is what you should go for - problem is the sump would likely hit the ground.
The 7.8L looks considerably de-tuned at 275 HP but the Torque looks very nice at stock. Adding a few bits and pieces I'm sure that would crank out 400HP and 1000 FPT.