you can either have it breating to atmosphere or to the manifold. the breather lets it go to atmosphere. just block off the breather, and run it (on the valve cover side) before the pcv valve. (this way all the gunk gets caught by it and keeps the pcv clean, making it last longer.) do it inline, dont "T" it.

it goes like this:
Valve cover-->Catch can inlet-->catch can outlet --> PCV valve --> manifold.

be shure to block off the filter good. us JB weld or something and make sure its a good seal.

also, the other nub on the valve cover you should not block off, you should stick the little breater on this end.

hope this helps