I have a 1970 chevelle with a 396/350hp. I'm looking to get a 7040204, which was the original Qjet. question i have is, were the carbs shipped with the engine, or assembled at the vehicle assembly line. Meaning, if the carb date is after the engine assembly date, but before the vehicle assembly date, would it still be considered within the right date range. I suppose the safest bet would be if it predates both, but 7040204 is hard enough to find as it is. Also, if anyone has 7040204 for sale i would be interested.