Just going by a couple of your previous pictures, it looks like you have 2 PCV valves in the valve cover? One of them should be an open hose vent to the air cleaner. If that's the case the engine isn't venting right, which could cause some oil consumption problems. I'm not sure how an engine would run with 2 PCV valves, but probably not good.

51 GMC 100 with 59 chevy 261 under the hood.
3 on the floor with 3.42 gear.