The recall letter is part of the documentation for a 69 Z28 built 3rd week of Dec, yes Cali built. TONS of paper, and is the first provable cowl hood car built.
The exhaust I had came off a spring car, - after the introduction of new colors and my dad remembers him having the car prior to the summer of 68. The head pipes were cut just after the down tube, the car was owned by the local Mercury Marine dealer's son, one of my father's best friends. Ossey Delaney - The car taken directly from the dealership in Greenville to Atlanta - Nalley - I think because they had a dyno and had side pipes, hurst shifter, scatter shield aluminum flywheel and shieffer clutch, bigger cam, and 4.88's and was dyno tuned. Dad said it was wicked on the streets around Greenville. He was given the exhaust when it was new, my dad had a 67 RS 327 275 which had crane cam head intake carb combo and he was going to put the exhaust on it, he had to go in the service, hated driving the camaro on the highway (6'1" 225lbs) and just never got around to it before trading on a loaded new 68 442 White over Blue with SS1's and redlines in the fall of 68 just after 69's introduction.
The exhaust hung in the basement of our house as a child then moved to storage at one of our buildings, when I bought my 68 RS/SS 396 in the late 80's my dad said - perfect place for that exhaust - I barely started restoring it before I got a 69 Stingray 350 350 4 spd, graduated high school, went off to college got a porsche turbo and in 93-94 I sold the 69 Corvette for $7500 and the Camaro as a project for I think $3500 the exhaust was stacked in the car with the rest of the boxes of parts.