If you can live with the looks, hey it's only 700 bucks.

GM made several diesels for passenger car engines at that time. The best (er, least bad) was the 5.7. Those earned a horrible reputation, but that was really more from the dealer techs not knowing how to service them than from the engines really being THAT bad. If properly maintained, they can do ok. There were also smaller displacement GM diesels, a 260 was one of them IIRC, and it made Car Craft's Ten Worst V-8 engines of all time.

The 6.2 and 6.5 are related engines used in pickup trucks and the Hummvee. As far as pickup truck diesels go, they aren't very good, but I've heard of lightly used examples surviving beyond 300,000 miles.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.