On every MB V-8 timing chain I have done, it appears to come up one link short. You have to loosen the tensioner (or remove it completely), this will free up a little slack in the new chain. Remember, the new chain isn't stretched. Of course this means getting the tensioner back in will be a chore, but it is doable.
Youo are installing a new tensioner to go with the new chain, aren't you?
'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.