Jon, I have that "Road Racing Detroit Style" as part of a racing tape that includes bits and pieces of amateur footage from Mosport, St. Jovite, Lime Rock, and I think Bridgehampton, and maybe some other tracks. If I can find it, I will ship it off to you and you can "convert it". Can't remember where this came from but may have been from Robert Hayes who at one time did some research on early Firebird race cars.
I drove in that 1970 Watkins Glen T/A rain race, but oddly, can't remember racing in the rain, and I'm sure we didn't have any rain tires! That was the race where we just got on the grid at the last minute because 4 guys toasted their engines in the warmup - hard to understand why they would flog their cars that hard in the warmup. My racing ream-mate that year, Dave (Paul) Lawler, also drove in that race - his 68 camaro was put into storage and has never surfaced. Dave passed away from cancer in the early nineties - he did 4 races in 1970 - best finish was 8th at Mid-Ohio - one of those guys who had some "raw talent".