Funny you mention, I had a similar experience with the CCC. I have a car with the year of manufacture 1980. As per the constitution on the web, it states that cars over 25 years are eligible. But when I inquired, they said that it is 30 years and older. There are only two of these cars in the coutry and the other one can been seen on the CCC motor shows.
Therefore, I also decided not to join the club.