I am going to change my stock 89 TBI valve covers for some billet alum ones. When facing the engine the current stock covers have 2 holes on the drivers side (one for the oil cap, and one for a breather tube that went on the stock air intake). The passenger side has one hole that has a tube that runs from the valve cover to the front of the TBI. My question is this, on the new valve covers they only have one hole on each and it came with a breather assembly that sticks up out of the valve cover. I am planning on using the stock oil cap on the drivers side hole and the passenger side is the problem. What is the stock hose (looks like a pcv valve??) used for and can I use the aftermarket breather assy in it's place?