Only four cars were produced, actually modified from Tipo C with the engine mounted lower into the chassis and a slimmer body. The chassis was derived from the Tipo C and the engine from the  8C 2900. The 308 was engineered by Gioacchino Colombo under the control of Enzo Ferrari who was then in charge of Alfa's racing team, Alfa Corse.
Only four cars were manufactured, with modifications to the Tipo C chassis and engine from the 8C 2900. The 308 was engineered by Gioacchino Colombo under Enzo Ferrari's guidance, who at that time led Alfa's racing team, Alfa Corse.