The Mille Miglia (Thousand Miles - pronounced ['mille 'miʎʎa]) was an open-road endurance race which took place in Italy twenty-four times from 1927 to 1957 (thirteen before the war, eleven from 1947). Like the older Targa Florio and later the Carrera Panamericana, the MM made Gran Turismo (Grand Touring) sports cars like Alfa Romeo, Ferrari, Maserati and Porsche famous. (http://en.wikipedia.org/wiki/Mille_Miglia)
The Alfa Romeo 6C name was used on road, race and sports cars made between 1925–1954 by Alfa Romeo. 6C refers to a straight 6 engine. The more powerful 6C 1750 (1752 cc actual) was introduced in 1929. Base model had a single overhead cam; Super Sport and Gran Sport versions had DOHC. Total production was 369. Winner of 1929 and 1930 Mille Miglia.