Drain the carbs, and get as much water out as you can, with the plugs out turn her over to get the water out of the cylinders. Take the cap off the dist and wipe it out. Use alcohol and wd 40 which will combine with water and help it evaporate. Then take her back to the lake and see if she will start. If she does run her until all the water is out and the engine warms everything up (several hours). If it will not start, you may have to tear her apart. Good luck JR