This may not apply to 1969, but in 1975 I was a senior engineer at Chevrolet research and development. I took a bunch of engineers to do drive audits at the Leeds plant that Fall. It was SOP to do central office drive audits when major changeovers occured. We drove cars off of the assy line and took them around a pre arranged circuit. Some may remember that KC had a big flash flood that year. My company car actually floated away when Rush Creek overflowed it's banks while we were out to dinner! We lost a lot of cars in the OK car lot at the plant that year too.