I can''t offer an opinion on how well the boat sailed since the winds were so light at that particular moment. plus, I was in a friend''s (slow) Newport 31, so almost anything else would''ve been faster in light air. Plus, the crew of the C-38 was drinking quite a bit.
As for the engine size, 25 HP for a boat that displaces 15900 lbs is skimpy by today''s standards, but about what you''d expect in a boat from that era. Today the rule of thumb is 1HP for each 500 lb of displacement, meaning the C-38 "should" have at least 32 HP. Personally I wouldn''t let that 7 HP stop you if the boat otherwise suits your needs/desires. My 2 cents anyway.