Expect to lay out a good bit of $$ to fix it properly...likely more then the car is worth unless it's in pristine condition otherwise :-/

Were I in your shoes I'd start looking for a Euro 500 drive line to drop in.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta