The car is a 735 S Scaglietti spyder s/n 0440/MD... 2940 CC, four cylinder, twin overhead cam, two 48 DCOE Weber carbs.
The photo was taken at the Dundrod, Ireland, RAC Tourist Trophy, September 11, 1954.
The drivers were Mike Hawthorn and Maurice Trintignant - they placed 2nd OA.
At that point, Mr Ferrari was becoming a bit disappointed with the performance of the four cylinder cars (in his eyes, second was unacceptable).
Good low-end torque but they tended to lose it at the top. Going to an oversquare configuration helped a bit but the writing was on the wall:
Go back to the Columbo V-12. To this day, the most successful engine in racing history.