[mr0077]

If you vent both valve covers into the air cleaner you would not need or want a PCV valve in one of them, since there wouldn't be any vacuum to actuate it and it would simply plug one hose. I guess you could hook up hoses between the valve covers and the air cleaner (no PCV), but you wouldn't get the benefit that a typical PCV hookup has.
Typical application has a PCV valve on one valve cover and either a vent hose, to the filtered side of the air cleaner, or a breather on the other valve cover. Under normal use the vacuum pulls vapors from the crankcase through the PCV into the engine (except at idle). The vent hose supplies filtered replacement air into the crankcase at the other valve cover for crossflow ventilation. Under hard use, with the vacuum near zero, the PCV is essentially non-functional and any excess pressure that doesn't go through the PCV is vented into the air cleaner through the vent nose and pulled into the engine there, or out the breather (possibly making a little mess on the valve cover). If you're getting a big mess at the breather, there may be too much excess crankcase pressure (blowby or?), and the hoses would be a better choice than a breather.
A normal setup should work for you unless you have less than 5" of vacuum. A breather on one valve cover works well for me and is simpler than hooking up a vent hose to the air cleaner.