The Joey Tidwell family of Dallas, Ga., recently purchased Spring  Fun Show Riders' Cup Three-Year-Old Stallion Champion, Lined Walkin'.  Lined Walkin' is trained by Joe Fleming Stables of Shelbyville, Tenn., and is shown by Justin Harris. Former owners were Buddy Wyatt   of Tuscaloosa, Ala., and Richard Cox of Columbus, Miss. This talented  grey stallion has been shown twice this season, also winning at Holly Springs, Miss., and will be campaigned for the Three-Year-Old World  Grand Championship.