Unprecedented!  19 Ferrari 250 GTOs (!), a 1963 330 LMB, a 1963 250 LMB, 6 Ferrari 250 GT SWB coupes, and a 250 GT SWB California contested this event.  (I really blew it with this group, always being busy with other things when it ran.  If anyone has photos or info to contribute I'd very much appreciate it!)     Images are clickable.
 

Greg Whitten -- 1964 Ferrari 250GTO	Leslie Davies -- 1962 Ferrari 250GTO
Frederico Kroyman -- 1963 Ferrari 250GTO	Jerry Lynch -- 1960 Ferrari 250GT SWB