I would recommend that you cease your search for an original pcv and go with the M.E.Wagner.
There are several reasons why. The originals are low perf items. Literally costing a few cents each new and performing every bit of worth the money.
PCV are not supposed to leak vacuum at idle but are supposed to open at a predetermined vacuum level roughly corresponding to the car at cruising.
That's the theory but in practice rarely achieved.
Wagner's leak the least at idle. Right around 1 in of mercury. The stock ones leak somewhere around 4 or 5.
At sudden wot opening they are all supposed to close to prevent a sudden lean mixture. Wagner's do. Stock? Maybe?
Wagner's are precision made and are EASILY adjustable to deal with the specifics of your camshaft vacuum characteristics.
To those who think the right thing to do is to run open valve cover breathers? There is data available that shows that a crankcase negatively pressurized (as a correct pvc system does) adds around 25hp to the engine.
Inches of mercury and psi are equivalent. 1 in of mercury is equal to 1 psi. A maximum of -12psi crankcase pressure is recommended. More then that and you can suck in the crankshaft seals.
You normally should have 10-12 at cruising but you need an installed vacuum gauge to see that.
The reasoning is that the vacuum helps seal the compression piston rings. So if you are running open breathers you are giving away around 25 hp. That's free horsepower to be gained just by running a functioning pcv system.
I have two of the M.E.Wagner units in two of my cars. One of them running "Webers".
They are dependable, made of stainless steel and completely rebuildable if need be.
I feel that I can vouch for them and recommend one to you if you are wise enough to run a pcv system. The M.E.Wagner would be a smart solution.