I recently picked up a 58 impala and I'm trying to nail down or at least ballpark when the car was assembled. I'm fairly confident that it's a correct car which is great because it's a 348 tri-power turboglide car. I'm just hoping someone knows more than I do and can help me confirm it because I'm going cross eyed from searching the internet for information. The vin is F58K1646XX and the body number on the cowl tag is 74XX. Any help is greatly appreciated.