Jerry MacNeish just left my shop. Spent a few hours with him while he went through my '68 Z28. Really nice guy. Had an interesting conversation while he did his thing.
He said that it was "a nice survivor", with matching numbers on the engine, tranny, rear end, rims, carb, and distributor. The booster, MC, fan clutch, radiator, and a few other pieces are not, all of which I knew.
I did all my homework before I bought the car, so I wasn't that worried, but it did eliminate any doubt at all as to the car's authenticity. The car is not perfect by a long stretch, but it's solid, it runs, drives, and stops, so I can drive it as is for now.
Chris