Reviving the thread with a cross post form another.
The "other" popular motion ignition box seemed to be Mark Ten B as seen on these two cars
I've heard they were or were similar to an equivelant HeathKit. Nice to see these old boxes also working on these cars.
I'm not sure if there was a rhyme or reason to which box would be used, but I really think the black box looks the best.
Popular Science Dec 1974
