I have a Euro model 107 500SL, AMG with 100,000 miles on it. I don't want it to jump a sprocket, I am not the original owner and I think it was poorly maintained before I got it. I think I should replace the timing chain and, I bet, a camshft. I am really considering both cams, rocker arms, timing chain and rails. I have one estimate and am getting another from local independants. They will use genuine MB parts, as I request. 1) Approximate cost? 2) Is the Euro cam different from the US 560 and 380? 3) Are their any high performance cams available? 4) Is there anything special to be concerned about?