I just came across a real find.
"allendale101" on Youtube has recently posted a pile of racing home movies from Julian Buesink's collection.
There is some really rare footage amongst it. Most impressively, there's footage of the inaugural Southern 500, and footage of MARC (now ARCA) from it's first two or three seasons, including footage from the second race in MARC history. What's better is that most of it is in color.
As a sidenote, the videos haven't appeared in "allendale101's" uploads, so you'll just have to find them by doing a search on Youtube.
updated by @simon-cook: 12/05/16 04:00:58PM