Lance Renshaw sent me this video link of the June Sprints in 1958. Just three years after the track opened.
It's strange to see the same track/corners as we see today, but get 10 feet off the track and it's like you were on mars. Really scary to see the starter (Bud Sevrens SP?) standing in the middle of the track for the whole race! No pit wall (or pit lane), just people standing 30 feet from the cars driving by at 100+ mph!
Watch and enjoy.
http://vimeo.com/49357431