When we have a situation like this (while street racing) we do whats called a mark-up, Both drivers aggress just how faster the bigger car is, Then the slower car is given a head start, Takes some practice, But if done right it puts the race right down to driver skill above all.
Persionally i dont see the point in a 8V vs 16V race, Its a like a 1.3 C vs 1.6 Driver race, Its obvious who is gonna come out on-top