It probably doesn't - especially if you're running a carb.
I'm not certain if that cast cover was ever fitted to the Samurai, it most likely came off of a Swift, which was fuel injected - the crankcase ventilation systems on fuel injected engines have two hoses, one to the inlet, and the other to the PCV system - they do it this way so all the air through the engine is metered.
It'll probably be easier to plug the one near the end with a rubber grommet.