Success!!! I rolled on the chain, put on the tensioner (not too bad, I just put it on on a part of the chain where the tension is not as high), then put it at TDC, and all 3 marks (cams, crank) are spot on!!
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."