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I'm not aware of any shops up that direction. This page:
http://micapeak.com/bmw/Airhead-Shops.html
shows the closest for Airheads is Grand Rapids. I checked this list:
http://www.ibmwr.org/dealers-independent.shtml
and see there's a shop in Interlochen. Ooops! I see you're from there! It says 1970-on but you might call and see if they have any suggestions.
You could also look at your Anonymous book and check nearby cities for members with codes that suggest they have an interest in vintage BMWs.
What's the "engine work" that you need done?
Good luck!