I had a heck of time with my 340 fouling it's PCV when it was mounted in the valve cover. I run a set of Cal-Custom valve covers which weren't originally baffled. Even after I made baffles I was still pulling oil, the covers are pretty short so there's not much clearance to the rockers. I run a HV oil pump too so I have pretty strong oil pressure, which throws a lot of oil around up top. I swapped out few different PVC's to get one that had the right amount of vacuum for my engine, but I didn't go to the adjustable kind. I did spend some time looking at that Wagner adjustable, but I bought a handful of cheap PCV's and just did a little trial and error instead. On the expensive side, I run a Trick Flow oil separator on it now. The PCV sits in the top of the catch can so it doesn't foul out, with -8 AN braided hose running back to an adaptor that fits into in the valve cover grommet (I run the adaptor without a restrictor, it was too restrictive for the PCV vacuum). Most of the road race and autoX guys need a remote PCV and raised breather system to keep from sloshing oil into everything, so, I figured I'd go overkill for now. The separator does get some oil, and it collects some moisture as well. Especially in the winter if I make too many short trips. Not saying its the right way to do it or anything, but that's what I run. I toyed with the idea of making everything, but the Trick Flow piece did everything I wanted it to do and then some so I just spent the money instead of spending hours and hours making something up.
https://www.summitracing.com/parts/tfs-51400850/overview/
https://www.summitracing.com/parts/tfs-51400861/overview/
