I had a 1977 42' Californian. Here is what I scanned in and cleaned up associated with a late 1970s vintage:
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https://drive.google.com/drive/folde...mk?usp=sharing
It says it covers both the Cat and Perkins versions, but it says very little about either, probably punting to their owners and workshop manuals.
I've got nothing on Cat engines, but have collected a bunch of other random documentation for late 1970s - 1990s era boat systems, is there something specifically you are looking for?