Narrowing your search for a 30 year old engine based on a couple specific (IMO unimportant) characteristics seems like splitting hairs to me. Any OM617 Turbo with good compression (you NEED to know the compression before dishing out cash, unless you get a super bargain) will suit your needs. Ideally an 85 would do, but I'd shoot anywhere from 82-85, there are a lot out there. You should have no problem finding a rusty car with a good engine, depending on location.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth