Its a Circa 1985 Thunderbird, Number 7, 7-11, Citgo Ford Fielded by Wood Bros. racing with Kyle Petty behind the wheel. One of the first widely distributed NASCAR marketing replica Karts. Completely restored might be worth something to a Wood Bros. Fan. But I see similar karts all the time for only a few hundred bucks.
I would restore it to someone else like Bill Elliot, Davey Allison, or another Ford driver and see if its uniqueness would make it worth more.