Well, you have a choice of conscience.
Nobody is going to inspect the smog controls on a 1963 car. That is three years older than even the California requirements.
On the other hand, the pcv valves were created to stop the really heavy pollution from the road-draft devices previously used. The standard argument that I have heard for many years is that a 1960 car causes more pollution just being parked than a post-1980 car does running.
So, rather than feel guilty, I would just clean out the hose and replace the pcv valve - its not much of your time or cost.
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