Yeah i realize SPD's aren't accurate. These M-codes were built in specific batches. That's why i said the 416 wasn't a good SPD. My white fastback is a 302 SPD but a lot of parts are dated the middle of April! That's 6 weeks later, so if the parts are dated 6 weeks later, when was the car ACTUALLY put together?????.........Can ANYONE else with original cars with date coded parts help out here? Just curious with SPD's and dated parts!!!!!