Keep the standard rudder
I have a ‘82 model with a swing keel and standard rudder, one of the few that came that way from Catalina.First, a kick-up rudder from Catalina Direct costs $714, and that is before shipping and crating charges. That is more than one of their full batten mains. So, unless you are sailing in shallow lakes, keep that standard rudder.Second, many have written and discussed volumes about modifications and repairs to the kick-up rudders primarily in an attempt to find a satisfactory solution to the tendency to rise or kick-up when one does not wish that to occur. Therefore, a used kick-up rudder may be sufficiently worn that it will require serious effort and a steep learning curve on your part to get it to operate properly. Much work when you wish you were sailing. So, as the standard rudder stays down very nicely on its own, why fix it if it an’t broke.I think you should consider yourself lucky to get a swing keel and standard rudder as this is, as Ted says, an unusual set up and will provide many more years of good service with perhaps only replacing the pintles and gudgeons, but that is another story.