If your still in Minnesota you can contact me and I may be able to help you or you can come and look at my coach. I am located in Elk River and there is a 78 Newell that I used to own in this park. I had the same engine that you have when I owned it but the last owner changed it to a 6V92. I suspect that the water supply is similar to what yours should be.
I think the 78 is now for sale but I do not know what they are asking for it.
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