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Welcome to Learning to Sail
It''s hard to say without knowing more about your boat. Talking to the former owner(s) would be best, but it may also be something you can solve by using SailNet''s e-mail lists and archives, which address a very large number of different boats.
If you have a full keel, I can''t imagine why a centerboard would be necessary, unless it is a shallow keel and the centerboard can be lowered in deeper water to provide additional stability and tracking to windward, helping to prevent sliding to leeward.
There is a model of the Catalina, for example, which has a swing keel--a centerboard which can be pulled up to nest inside a shallow keel to make trailering easier.