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Raceprops,
If you want a gas engine with torque down low like a diesel, I would suggest you find a 8.1L out of a 2001-2007 Chevy/GMC 2500HD, 3500, Van, Suburban, Avalanche, etcetera. They are cheap in junkyards, and low mileage examples can be found. I have one of those engines in my 2001 2500HD heavy hauling/ towing rig. That engine makes unbelievable torque right off idle basically flat torque curve from 1000 right to 4000 rpm. My 8.1L 2500HD Allison 5 speed always got better gas mileage (11-14) than my 1991 K2500LD (10-12) with the TBI 5.7l when it had the 4l60e despite the former being being dimensionally larger, way heavier, worse 4.10 gearing, wider tires, etcetera. Despite the internet lore the 8.1L is a great engine.
For fuel economy I would put a Tremec 6 speed manual behind one with the 0.5 overdrive, tallest rear end gears possible, and "lug" it as it can handle it fine.
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