Have you adjusted the valves yet?
Might also want to do a timing chain and rails if you have no idea when they were done (if ever) and you have over 100K on the clock.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.