You'll replace your old engine w/ a long block, ie, block, heads, intake etc.....

Thus, you yank your old engine, pull the accesories/exhaust manifolds off, put them on the new engine and re-install.

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