The friend of mine, who inherited this 69Z, received it from his sister. My friend's deceased brother-in-law purchased this car new and drove the car until 19,000 miles then parked it when it developed an engine problem. The engine problem was never fixed and this car was literally stored in a barn for 30 years until my friend took possession of the car.
Fortunately when my friend took possession of this Oct. '69, "10D", Norwood build Z28, it came complete with P.O.P, build sheet, window sticker, plus warranty related service work and misc, other service receipts. His brother-in-law even kept complete records of every oil change, and gas fill up and recorded the MPG! The car is a complete, original car. I am 99% sure that the alternator on this car is original to this car.
I live in Indianapolis and have a number of contacts that worked at the GM Delco Plant in Anderson, IN, about 35 miles NE of Indy. I'll try to track someone down who worked in the Delco-Remy plant who may be able to confirm the numbers connected to the CZ stamping.