When an estimated 6,000 to 8,000 Corvette enthusiasts roll into Bowling Green in three years for the 20th anniversary of the National Corvette Museum, officials plan to have a new attraction to show off. Wendell Strode, executive director of the museum, discussed plans Wednesday for a $20 million-plus motorsports park to be built south of Interstate 65 near Exit 28, not far from the museum and General Motors’ Bowling Green Assembly Plant, where Chevy Corvettes are built.