I started my road racing with a 998cc Mini Cooper in Ontario at both Mosport and Harewood in 1966, both with a friends modified street car and then a purpose built low budget race car. They certainly were fun to drive - not much power and you had to learn about FWD.
Your best bet for photos and stories would be Wheelspin News issues, Canada Track & Traffic issues, and maybe put a notice on the Canadian Motor Sport History Group forum. Also contact the VARAC group who run the vintage festeval at Mosport coming up June 23-25. There should be several racing Minis there. I am assuming you are in Ontario, but if you are in BC, come out to the annual ABFM at Van Dusen gardens May 20 - might see a few racing Minis on display. Check out the arperformance mini website.