The various Chevelle and Corvette sites have info on casting to build dates.

Some folks might not know that virtually every component of the vehicle has a date cast or stamped on it.. Alternators, Distributors, Radiators, Carburetors, Radios, Heaters, Transmission Cases and Covers, Axle Housings, Water Pumps, Spark Plug Wires,Intake and Exhaust manifolds, Wiper Motors, Bell Housings, Wheels, Beds, Steering Boxes to name a few are all dated.

Part of my enjoyment is checking these out to see what is probably original to my vehicle and like jb66ss396 is doing , trying to figure when it all came together.