My 1966 cj5 has a PCV. I never knew about it until someone here on the forum months ago guided me to it. One end of the PCV is 'hidden' inside the lower end of a hose that extends downward about 12" from the valve cover to a brass fitting beneath the carb (but on the engine body). The PCV is screwed into the brass fitting. To help identify the brass fitting, there is a thin straw-like rod on the opposite part of the brass fitting, to which connected is a thin hose (I think it goes into the jeep to the heater diaphram (I'll have to check on that tonite). In any case, when I realized that there was a PVC hidden in a PVC hose beneath the carb, I pulled it and found much goop to clean out with cleaners. I got the PCV spring inside to bobble around again when shaking the cleaned PCV (before replacing it). If I recall, I got a better idle at that time after the cleaning. I can take a pic tonite if you think you need one to examine for PCV location.