[Mr70]

As Kurt stated,it's a late 1969 production rearend.
The assembly date of 10/30 is most likely 69.Check the Housing cast date as well to confirm.They made the 69 Camaro's much later then usual.
Chevrolet instituted the letter "C" in 1970,with their drive train components to help identify their applications better.
"C" stands for Passenger Car.
"T" stands for Truck.