Wiper linkage questions 67-9 cuda

The 2822 963 (which seems to be a 2 speed motor in sprite of claims otherwise) is in my car, which if I'm interpreting the scheduled build date correctly, it was December 16.
And if I'm interpreting the wiper motor stamp correct, 3326 = Nov 28, 1966. So this was a standard equiped car, built in 66.
Mentioning this just in case the build date relates to what a car got.