The Nissan SD-33 was available from 1976 'till 1980. For the '80 model year, it had a turbocharger (SD-33T). The close-ratio T-19 was used, for the most part, although some TF727 automatics were used as well (and SD-33's with the auto are complete dogs). If it runs well, it could be worth some decent money. Engines, and parts, aren't all that commonly available. Most gasburner IH people don't like the diesel, but there is a decent-sized diesel following out there (I'm part of it
). Hope that helps! Good luck! Any more questions, post or E-mail...
1980 International-Harvester Scout II SD-33T