That port is for power brakes and the PVC should be moved to the front of the carb.
A breather period is good, better if it is to the air cleaner. As the engine develops pressure inside, along with the smoke from heated oil & the minor blow by the piston ring contamination, the breather let’s the pressure out and if it is connected to the air cleaner, a minor vacuum is introduced which will help keep the engine clean inside, help piston ring seal & not allow a breather not connected to puff out smoke and coat the engine in a film of dirty oiled drip oil on the valve covers. Which will over time collect enough to drop down on the engine making it dirtier.
