New member to the airboat world. I'm a big duck hunter and have always thought that the aluminum boats converted into an airboat was the ideal duck hunting machine, so I ended up buying one. The boat has an 85hp Continental aircraft engine which needs work. I had a mechanic open it up today and said that the engine might need a complete overhaul. He thinks the crankshaft could be bent, and tomorrow he will take it out and know more. Could someone tell me around how much this cost? I'm new to this and don't have a clue.