Just out of curiosity, how much chain stretch have you measured?
167K isn't really a whole lot for that chain. A visual inspection of the chain and an accurate measurement of stretch will give you an idea of where you stand instead of just throwing parts at it.
There is
tons of information on timing chains in the archives. Here are a few to get you started:
http://www.peachparts.com/shopforum/showthread.php?t=96572
617 '05' Camshaft Specifications:
Q on timing chain stretch...
W123 Timing Chain Stretch
Whether you decide to replace the chain or just add an woodruff key at least now you'll be informed.
Quote:
and can I change the cam gear by just pulling it off the cam and putting a new one on? I just wanted a new chain! Arrrgh.
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You don't need to remove the cam to replace the sprocket. There are directions in that on-line manual BHD posted.
Danny