The draft side of a PCV system should be baffled sop it does not draw
oil from the head.
Oil sprays up from the rocker, push rod and valve spring assemblies as part of the lubrication process.
A baffle should be placed over the PCV valve port opening so only the air is drafted from the crankcase.
A breather provides fresh air to replace the drafted air.
As a matter of economics, it is least expensive to vent the rocker cover to the filtered air at the carburator air horn. Most use a pipe or hose connected to the base of the air cleaner and run that to the rocker cover. Then the PCV valve is installed in the other valve/rocker cover and it is connected to the 3/8 to 1/2 inch barbed fitting at the base of the carb.
Just my $0.02