Its pretty perplexing that a Cal 25 would have been built without a reefing arrangement. Is there a chance it has a roller furling boom?
If not, are there a reefing tack hook and a reefing line block? If not I would efinitely have a sailmaker add at least one reef point, then add the necessary tackle for reefing. See the thread Reefing, Spiral Lacing vs single line and how to tell what you've got?
for relevant details.