I do not think it was Shelby Blue because that was either on his 1965 cars Guardsman Blue or according to my friend John Allen Caspian Blue. But FAV was formed before Shelby took over racing in 1965 and the Big Blocks in 1965 could be a Shelby colour but the 1964 prototype was a dark Blue with black sills and looks different to the 1965 Big Blocks.