To vent or not to vent?

[Thundarr]

Whenever I run my AC full blast and recirclate the cab air, I seem to be pulling in some exhaust smell. I don't smell it when I am moving above 20-30 mph. It's only when I slow down or sit in traffic. The PO put in an 80's era GM Goodwrench 350. Here is a picture of the current setup. I have a PCV from the drivers side valve cover connected straight into the carb and then a filter on the passenger side valve cover. There is no charcoal canister.



I recently put in shorty headers so I know the exhaust is all connected up well but the smell still persists. I did just find that I am missing the boot over the brake lever that goes through the firewall which could be sucking in some of the engine bay/crank case vented fumes.

I have ordered and will install a new boot on the brake lever to better seal up the firewall, but I also ordered a charcoal canister and plan to properly add the "T"in the hose from the drivers side PCV to the carb and then over to the canister.

So now getting to my question, what do I do with the passenger side filter? I have noticed that a lot of setups don't have a filter on the passenger side. Should I:
A.) plug it?
B.) switch it to another pcv and "T" it into the the line to the canister also?
C.) just leave it be and hope the boot fixes it?