Here's some information about his cars: http://imcdb.org/vehicle.php?id=265277 and a bit more morbid: http://www.imcdb.org/vehicle_210628-Cunningham-Funeral-Coach.html

An article from Sports Car Market Magazine - November 2008 about the "ex-Rudolf Valentino 1927 Isotta Fraschini 8A":



I don't have a copy of that particular film, but it is available on DVD apparently.