Steve,

That car lot was called Performance Classics and was in Eagle Rock, CA between Glendale and Pasadena. It was owned by my friend Dave Miller. Dave tells me he was selling the car for the movie company. The car was a '67, not a '68. It was being sold on ebay in 2004 and I recorded the VIN number from the ad at that time.

"Eat My Dust" starring Ron Howard is another fun movie from the '70s that featured an early Camaro getting into high speed shenanigans.