This photo shows a PCV retro-fit using a 4V and the 2V style vacuum source.
The trouble with using this vacuum source (initial design was for power brake/vacuum WS WIPER) only sources two intake runners for a vacuum signal (see below attached) and the vapors are not evenly distributed among all cylinders as does one using a carb space with nipple.
So,
IMO whomever designed theis add-on system had his stuff in one neat little pile.
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- WHY IS IT ... 
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... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag?
WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order)