Well, for what it's worth, car #44 was a Fiat 1100MM berlinetta driven by Gilera/Giovanni. I have watched the British Pathe film and it does not name the cars in your puzzle. I reckon 4popoid deserves the point for identifying the actual event and one of the cars - I can only assume that the "certain site" that provides reasonably accurate records of these races was wrong on this one, regarding the other car.