Breather to PCV
The breather does "not" have to be connected to the air cleaner. Install a push on, or twist on breather in the valve cover.
If you have baffles inside the valve covers, like the factory did, blow by shouldn't be an issue. Give it a wipe with a rag on occasion.
On the other valve cover you have a pcv valve. That will need to be connected to the appropriate port on the carb.
408...Can you post a pic of the said motor and valve covers ?