Unbaffled valve covers on PCV systems can result in gobs of
oil getting sucked up. The easiest way to tell is to just plug off your PCV, adjust your carbs so the engine runs nicely, and then check your
oil consumption after 500 miles. PCV is a good thing though, so don't get rid of it just because of
oil consumption. The classic method of testing your valve is to pinch your hose or put your finger over the end of the valve. Remember though, a PCV is a "controlled manifold leak" and that particular valve might fit, but not be exactly right for your engine. But if your
only complaint is the oil consumption, then putting a baffle in your cover is the answer. Here's a nice little write up on what a PCV valve does to get you up to speed:
http://mgaguru.com/mgtech/engine/cv103.htm