TexAndy
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The IDI engine has decent potential, however, The problem with them is the compression is so high on them compared to the powerstroke that if you Turbo it, you can only get 5-10PSI of boost reliably, which would be enough. If it were I, I would sell your current 7.3, then buy a an actual powerstroke. You would be able to get between 14 and 18 MPG with it if you can keep your RPMS below 2000. The powerstroke is most fuel efficient at 1600 rpm. If you go the Powerstroke route there is also a major aftermarket for the engine, power adders and such. You could push that 275hp up to 400 hp easily and the engine will live.
That being said, in my opinion, if you want power and mileage, go the powerstroke route. If you want to just use what you've got, I don't think you will be un-happy with it, but it will not be fast, although it could be made to go faster with the addition of a small wastegated turbo set to open about 7psi.
What's the max rated HP engine you can run in a deuce before you start running the risk of producing too much torque in any particular gear for:
Transmission, transfer case, axle gears, driveshaft, etc...