Kenny, if it really is a 350 out of a 96 corvette, it is an LT1 or possibly an LT4. The LT1 uses a reversed cooling system. Unless the cooling system of the boat was designed for this engine or modified for it, you will suffer cooling system problems. The quickest way to verify if it is an LT1 or LT4 is to look at the side of the engine block. If you see a "327" casting on the side of the block, it is an LT1. I would definitely recommend not using this type of engine in a marine application. You are asking for problems if you do. I would seek out a standard small block to replace it.