As an enthusiast who has run the modern Mille Miglia five times, Carl Gustav Magnusson didn’t have to think long about which car he wanted when he began planning his sixth run. In his previous five races, each driven with a different family member by his side, Magnusson had piloted a Fiat Abarth Zagato 750 GT Corsa, a car that more than makes up for its small stature by packing a whollop of pedigree, performance, and noise. Magnusson thus went looking for, and found, his current “double bubble” which, like its predecessor, has served as a passport to the golden age of road racing. For three decades and twenty-four races, the Mille Miglia was among the most grueling races anywhere on the planet. From 1927 to 1957, racers from around the world tore across a thousand Roman miles of Northern Italy, drawing millions of spectators and making GT sports cars from Ferrari, Porsche, Maserati, and Alfa Romeo–among other marques–famous