I had 2 pcv Valves originally the one on the drivers side went to the bottom of the air cleaner and passenger side went to vacuum on carb. Scott at CK pointed out i was plumbed in all wrong when he supplied me with the new carb and manifold.New set up will be pcv Valve to vacuum bottom of carb. Breather as you see on other side and then vacuum from brake booster to bottom of carb and vacuum advance from dizzy to vacuum top of carb.I'll probably rubber bung the air cleaner hole