Consider that there will be assmebled parts for inventory and these will be pulled as needed, or sent as special orders came. GM , I am certain , would keep X amount of stock in inventory as needed! This is where the dates will move around. Consider that Baby Blue Z28 from Coloardo recently, all the orders placed but parts not in inventory, for example. Even the ZL1 cars lacked parts to meet a predetermined December timeline. But Chevrolet was really crankin' about January, 1969 so many parts could be floating about the assembly plants
