Air goes into the valve cover through a vented fill cap or a line plumbed into the "clean" side of the air filter element, and out of the modified crankcase vent standpipe with a PCV valve installed instead of a draft tube. DO NOT eliminate the standpipe and install some sort of Mickey Mouse plug with a PCV installed into it- - - -you'll end up using massive amounts of oil. There absolutely must be a positive flow of air through the engine, not a single line with a PCV in it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!