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On mine I have a Ford Racing breather cap and on the other side I have a K&N filter breather cap. My carb didn't have a connection for a pcv valve so I went that route.
The PCV valve should be on the hose connected to the vacuum meter the crankcase vapor to the intake.
The PCV system on my 390 is
PCV valve in passenger valve cover next to firewall
Hose from valve to back base of carb
Oil fill cap on driver side valve cover with hose to air filter mounted in air cleaner assebly.
Putting the valve on the intake side of the system will not allow the system to function properly.
An excellent answer to a question I posed on another forum. The information you supplied matches exactly what I was told and finally, with that knowledge, found on my '74 F100 with a 360.