Nice find, and welcome to the site! Can you post some pictures for us too? Is it one of the Super Swamp Foxes with the big 26" tires or is it a standard Swamp Fox with 21's? The dual wheels and jet pump must make it pretty fast in the water. I've seen factory installed Berkley jet pumps on early fiberglass body Hustlers and those lime green SPD Wedge 6x6's, but never on a Swamp Fox.......you have a very rare machine on your hands!!!
Have fun with it and keep working on it and making it look great.