A correctly done PCV system for a SBF will be as follows. If you are running a healthy cam utilize the PCV Valve used in a High Performance 289 from 65-66-67 vintage. Put it in the passenger side (RH valve cover) and plumb it into the rear base of the Holley Carb. If the carb does not have a tube you will need to add a vented plate under the carb, they were OEM from Ford and are readily available on Ebay and from many other vendors. Then to seal the system you can run a 5/8" hose from a non vented
Oil Filler cap on the Drivers Side (LH side) Valve Cover to a fitting on the base of the air filter assembly. Clones of the 289 Hipo air cleaner assembly can be had for about $39.00. Its a nice setup.