I have a 83' with a U shaped dinette. Ive seen other boats built the same year with L shaped dinettes. Was this just an option offered then? Im trying to see if there was any other differences. Also, when I bought the boat, I had an engine inspection done. The owner insisted that the engine is a Universal M30 but the mechanic kept telling me it's an M25. Is there a data plate somewhere on the engine that I can check to verify this?