I have an 1989 Thompson Fisherman 210 with 4.3 Alpha One Mercruiser. I did check stringers and transom. Put a new floor in it and all new upholstery when I bought it. It has been an outstanding boat. The 21 is plenty powerful enough, running 30+ on the Erie chop many times I have to back off. I have also done plenty of watersports behind it too when the family is with me. Just know what you're looking for condition wise, but Thompson's ride great on the lake. They also seem to be affordable.