[toddman67]

On valve covers with 3 holes for both as mentioned, 1 for oil fill, 1 for pcv, 1 for breather going either to air cleaner housing or stack under air cleaner.
PCV valve system would be advantageous to your engine and the passengers. The engine through its combustion process builds gases which need to be evacuated for performance as well as a host of other processes. Oil leaks and carbon build up are 2 of the problems associated with lack of engine breathers.
Prior to PCV, Older engine designs used a draft tube similar to the diesel engine to remove these gases.
I suggest using the PCV system and either a breather or a vented oil cap for the best results.