Clearance for RPM Air Gap...

What is on the other end of the hoses that go to the valve covers? I assume one is a breather and the other is a PCV valve? I don't recall it being common to have hoses hooked to both valve covers.

Most instances I can think of, at least on these old Mopars, have a hose coming from the PCV valve to either the air cleaner or the vacuum port on the carb and the other valve cover has a breather. This allows fresh air to be pulled into the motor on one side, and pressure in the crankcase to be drawn out through the PCV valve.

I don't know that you would want both lines T'd into the vacuum port on the base of the carb. I believe the engine crankcase needs to be able to breath.