Machine shop needed central or southern NJ area

[geob]

My C230 is just about to turn 300,000 miles but the head gasket appears to be leaking. Coolant was disappearing with no visible signs of leakage. I pulled the plugs and number 4 had some white crystal like stuff on it. I picked up a block tester and did the test and sure enough there was hydrocarbons coming through the coolant. My next step is to pull the head off and send it out to a machine shop and have it checked for any cracks and then skimmed. Does anyone know of a machine shop in the central or southern NJ area that can do this kind of work on a Mercedes?