I was lucky enough to see this car (chassis number 2525) and snap some pics of it at the Ferrari Historic Challenge at Sears Point/Infineon Raceway in 2004. The owner, an amiable and affable man who wore his wealth well and drove the snot out of this thing on the track, informed me that it was one of a pair of cars built with an offset driveshaft to allow the driver to sit lower in the chassis. Only raced once by the factory, with none other than Stirling Moss at the wheel, at Monza in 1956, where it placed first. A picture of the car in action during that race can be found here.