A833 - Identification and HELP!!

Yep,... According to the calendar, it specifically is May 14th, 1971.

As far as a rebuild kit and source for parts, I would go straight to Brewers performance in Ohio. They have a ton of information on their website and have been very helpful in the past. (Link below). Click on the "Before you order" tab and there is a ton of information to help identify exactly what you have

Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists