Create a world were Nascar's old Speedway Division(open-wheel with stock engines), Grand American Division(competitor to the Trans Am Series), and Convertible Division are still around. Speedway Division ran for two seasons(1952-1953), Grand American Division ran for four seasons(1968-1971), and Convertible Division ran for four seasons(1956-1959). Keep the Sportsman division(now the Nationwide) as Nascar's short track race division. Keep the Cup, Truck, and Modifieds series the same.
I see Speedway Division evolve into series like the Atlantic Championship. Grand American Division evolve into the top Touring car series in the United States. Convertible Division evolve into series like the ARCA but with Convertibles.
Schedule
Cup series runs 30 races with 26 Ovals and 4 road courses
Sportsman division runs 25 races all short-tracks
Truck series runs 23 races all Ovals
Modified series runs 20 races with 18 Ovals and 2 road courses
Grand American Division runs 18 races all road courses
Convertible Division runs 17 races with 14 Ovals and 3 road courses
Speedway Division runs 15 races with 10 Ovals and 5 road courses
I see Speedway Division evolve into series like the Atlantic Championship. Grand American Division evolve into the top Touring car series in the United States. Convertible Division evolve into series like the ARCA but with Convertibles.
Schedule
Cup series runs 30 races with 26 Ovals and 4 road courses
Sportsman division runs 25 races all short-tracks
Truck series runs 23 races all Ovals
Modified series runs 20 races with 18 Ovals and 2 road courses
Grand American Division runs 18 races all road courses
Convertible Division runs 17 races with 14 Ovals and 3 road courses
Speedway Division runs 15 races with 10 Ovals and 5 road courses