I am trying to figure out how my pcv system works since I am running an LSJ intake manifold on L61. Is the port that would go to my intake manifold plugged now? Is the nipple on my valve cover essentially just a breather now?

The reason I ask is because I recentally installed a cheap catch can setup. At the same time I have started burning or using oil as the level drops and it never did that before the catch can. Before the catch can I was just running a breather filter on the nipple and never noticeably dropped oil level. Of course this could just be a coincidence but that is what I am trying to figure out. Any feedback on this issue is greatly appreciated.