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In some respects the intake cam marker going missing is good news! If you look in the factory service manual for the W123 / W126 there's a section for the M110 engine that has a chapter for checking the camshaft timing. This is chapter 05-215. It concerns the position of the intake cam lobe over cylinder #1 with respect to the crankshaft position.
This is often referred to as the "2mm lift" method and is frequently discussed for diesel engines. Whilst there is lots of documentation / internet how to's showing the method on single cam diesel engines there isn't all that much (if any?) for the twin cam petrol engines.
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