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.
The recycled and reburned smoke keeps everything cleaner. All of my engines with exception to the race only mill get this.
