Heat exchanger??

[chris_craft]

Now she is water tight and running! The next step is to look at converting the engine to run with a heat exchanger! Well at least I think thats what I need as I am going to be using it in salt water and at the moment its a straight forward scoop, circulate and then out the back - not good for the block!! Any help advise welcome and appreciated! Chevrolet 283 is the engine in question! Thanks