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Bloo, the only other thing I can think of is the block is loaded with rusty scale.There should be a drain plug on both sides of the block under the exaust manifold. Pull the plugs and see if water flows out.If not fish around with a small piece of wire and see if its loaded with rust. If it is pop out all the freeze plugs and flush all the crap out.Make sure you replace with brass freeze plugs. If the boat stays in the water with salt water cooling this is fairly common with older engines. Im assuming the engine runs fine, if it is skipping or running rough when it heats up you probably have a cracked head orbad head gasket.
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