PCV system on 383 4bbl

I was there in the early '60's as smog laws were changing. Frustrating time for mechanics as this was impacting used cars as well. Just to clarify- the presence of a hose from the a/c to the valve cover breather makes this a "closed system". Previous models were vented to the atmosphere, leading to some oil misting on valve cover. The purpose of the "closed" system was a "smog" requirement preventing crankcase gasses from escaping into the atmosphere. Performance? If you have a 10-sec car or better, you might consider eliminating the PVC system.