318 Motor, please help

The PCV HAS to be routed to the underside of the PRIMARY throttle valves.
If you route it to the Secondary side, on an engine with a high idle vacuum, the rear cylinders will idle lean. This usually causes a tip-in sag, once the idle speed is back to normal.
At WOT it it does not matter.
If your carb does not have a port on the front,and does not route the PCV into the vicinity of the idle discharge ports and if it was mine, I would either put one there or shelf it.