old 70s corvette stingray gocart with 3 horse briggs

I have a 1970s corvette stingray gocart its red and it has a signature by Zora Duntov on the door on both sides it has the original 3 horse briggs and stratton that runs perfect. Is this item worth anything or is it just another gocart. It was made by FW associates out of tempe Arizona its called a mini car. everything is original looks almost new any help or info on this item will greatly be appreciated. It also has 2 stickers on each side that says limited edition.