In the meantime just open up the Maranello5 and Maranello6 veh files and change the team name entries from Scuderia Maranello to.. well, anything else.
They can be found under Formula Classic->Scuderia Maranello->scroll down in the drivers list, there are 4 cars.
I don't know if you can race then together with other Formula Reiza cars, or that the game loads with Classic cars.