My set has an electronically controlled PCV valve between the block breather and the plenum mounted on the manifold flange in the middle. Part No. 22230-34031.
Judging by the bulges in the top (cam cover) breather hose on the picture that I posted in your other thread that exist at the cam cover end of the hose, I reckon there should be one in there too. I don't have one of these though.
For our 18RGU (missing PCV valves we blocked the block breather (18RC blank plate) we used a Catch can: small "International Roast" coffee tin with a couple of 90 degree copper plumbing bends solder-mounted in the lid. This was mounted to the fire wall at the 18RC throttle mounts and filled with the curley heavy duty stainless steel pot scourer so that the air-suspended oil wouldn't go into the intake (air filters kept getting saturated in oil).
This has worked quite well, as would any other catch can that is filled with some sort of condensation promoting material.