I would leave the PCV valve installed and working. It will keep your crankcase cleaner by extracting vapors, and will keep the outside of your engine cleaner by minimizing the leaks.
"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968