I was working in service stations in the early 1960s when CA mandated PCV, I think most of the standard Mopar passenger cars had them stock from either 1962 or 1963
The road draft tubes that hung down under the engines where relying on the passing air to help suck the fumes out of the motor, didn't work well at slow speed or when stop either
As far as the engine blow by hurting the engine if it is bad enough to see it is time to fix it
Water of any type in the engine oil or any other part(tranny, rear end) being lube is not good