I thought I was finding the original engine to my friend's '74 Z/28 today, but it turned out to be a '69 DZ engine. I looked over the engine quickly to find that it looks good overall. It's been bored .030 over, has correct '69 Z TRW pistons, and a 400 cubic inch crankshaft. The production code is V0519DZ and looks like a legit stamp to me. I'll post photos later. The engine casting # is 3970010 and the casting date is 5-13-9. I hope to re-unite this engine with the original car.