Some of the more notable 250 GTOs present:
1961 Ferrari 250 GT Sperimentale, chassis 2643GT: This is regarded as the 250 GTO prototype, being the first Ferrari to combine the 250 SWB chassis and the race-spec 3.0L V12. The car raced at Le Mans in 1961 and at Daytona in 1962 with Stirling Moss behind the wheel.
1962 Ferrari 250 GTO, chassis 3223GT: This is the first official 250 GTO built. The car has several distinctive features including mis-matched headlights that were thrown on the car during a race at Daytona to help the drivers see the wall on the banking at night. This car was selected as the best in class.
1962 Ferrari 250 GTO, chassis 3705GT:This 250 GTO has one of the best racing histories, finishing first in class at the 1962 24 Hours of Le Mans, second overall. The car won every race it entered in 1965.
1964 Ferrari 250 GTO/64, chassis 5571GT:The first of three Series II 250 GTOs that features the lower and shorter Pininfarina body. The car raced at Sebring and Le Mans and was driven to victory at Daytona by Phil Hill.
You can see these 250 GTOs and the rest from the 50th anniversary celebration at Pebble Beach in the high-res gallery above.