Joe,
This may be of some help
Google Search for air cleaner to valve cover pipeOne of the parts displayed may be suitable or modified to meet your need as I believe the pipe diameter is the same as what you need.
Also, just to clarify, your "oil fill" hole sounds like it currently has a breather style unit cap???
FWIW, having previously owned a '65 230 with a PCV set-up, that oil fill cap should be closed (solid cap with no breather). I have attached some added pictures that may help demonstrate.
Only difference between the pictures is where your PCV intake line connects, air cleaner bottom of base or side of air cleaner body. Both show a closed (non-vented) oil fill cap.
Let us know if any of this is helpful.