Need advice on used engine

Did the 1966 engine have a PCV (CCV) system?

Yes, just like the picture shows.

PS: just a FYI, the hose connected the the base of the carb, and the passage in the carb would get plugged up, and the PCV would not work, even when changing the valve and/or hose. Usually required removing the carb and using a drill bit (by hand) to clean the right angle passage. A base gasket not installed properly would also stop the PCV from functioning.