1967 thru 1970 was an interesting time in and around Detroit. Just about every car manufacturer was marketing a supercar, (the politically correct term for musclecars). And they were all image conscious. It was common practice for them to assign a young engineer a street brawler to cruise the local streets..... Woodward ave, Square Lake road and Telegraph road amongst others.
Spring of 69, I had my first brand new car. A A12 Road Runner that I spec'd out and ordered. one evening, sitting at a stop light on Woodward ave a new 69 Hurst Olds 442 pulled along side. We both knew what was going to happen. The light turned green and that 442 leaped out at least a car length in front. I was shocked! My A12 had a 4:10 Dana and I wasen't sleeping. I caught up at the top of second gear, (Torqueflight), and we had to step out of the throttle for another stop light.
I noticed the "M" in the rear tag of the Olds and found out the guy was a engineer in a factory blue printed 442 with a 5:12 gear. An image car not set up to go fast, but to go quick. I learned to watch for that "M", (manufacturer), license plate in the future.