Sorta. Look at the picture in post #2. Those type breathers on that driver's side valve cover are open on the bottom side. Though that is technically called a closed PCV system, it's really not. Now, if that was one of the valve cover breathers from about 1971, it would be completely closed and have another tube with a hose that went to the charcoal canister......I believe. There was a second tube that went "somewhere", but the breather was closed.
