Ben,
No experience with MB heads, but:
I would remove the glow plug chambers and try to clean them. If they do not clean up, I would replace them.
I would replace all the glow pugs while it is easy.
I would clean all the carbon off the head and try to figure a way to test the valves (If you don't have a better way - turn the head so the ports are up, pour gasoline in each port, and see if the gas leaks out.)
I would clean all the carbon off the pistons, but be careful not to get the carbon bits into the engine.
Lots of work - good luck.
Bobby
Well got the head off the donor car today (recall needing to R&R the head on a 1979 W116 300SD). First time doing this so...
If the experts would care to gander at the photos and give me their feedback, I'd be ever so grateful!
http://picasaweb.google.com/116318077355015592300/300SDHeadTurboRedux#
Ben near Detroit
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Toward freedom,
Bobby Yates Emory
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