Two ways to do the PVC thing
There's the HH setup with a breather in one cover and a bung in the other. Very effective but not very nostalgic looking.
The other way is to put nostalgic breathers on the valve covers and install the PCV valve (via a short hose) into the rear of the valley cover or into a bung in the oil filler tube. In both cases of this method, the open end of the breather tube MUST be plugged/capped off in order to force the inlet air to go through the two breathers.
One thing you need to consider doing when you use the valley cover PCV location is to incorporate some sort of a baffle to prevent the pCV valve from sucking oil out of the engine. I simply sectioned the bottom half of the stock valley cover pieces and put it right back on the engine under the O'Brien Truckers valley cover.