Put a vented valve cover cap onto the 1954 non-vented valve cover and you engine will be OK.
Do you have a PCV valve?
If you you do, show a photo of the “plumbing” and the valve cover.
Depending on the PCV set-up (and valve cover) you may need to replace the valve-cover to a valve cover with no “slits” in the top of it?
Stove, I posted this while you were posting your last post
Last edited by tclederman; 09/18/2021 10:20 PM. Reason: Added clarification information.
