Have an Earl's breather in the rear driver side valve cover and a matching cap with the PCV built in and an AN -6 fitting on the front driver side cover. The rear goose-neck breather is now blocked off as I was getting a lot of mist being thrown out of that breather.
Here's a close up of the breather retainers I installed which seem to seal and hold the breather caps down much better and have baffles built in.
Summit part # CSI-680 $49.95
So far so good