If the chain guides break, the timing chain will likely break. If either break you can expect to have bent valves on the left head, plus be prepared to see up to 16 broken rocker arms on the left head too.
Long story short - get the chain and upper guides changed ASAP.
Maybe you should buy a couple lottery tickets. You've been lucky.
'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.