I ran across a file of the work I did on a 997cc Cooper belonging to a Joe Casper. This was in October 1976. The car had just under 40,000 miles on it at the time but needed some serious clutch work, among other odds and ends. There was no engine number and if there was a chassis number I didn't record it.
If for some strange reason you have the car once owned by Joe; know Joe; or have a way of contacting him, let me know and I'd be happy to pass on the information.
If there are no leads, the file gets tossed.