Zack -- Remove your rear seat and look underneath. If you don't see the build sheet under the springs (probably on the passenger side), remove the seat back and check under those springs. Date of manufacture will be on the build sheet. There are a couple other clever places where people have found their build sheets, but those are the two most frequently used. If not there, check under the front seat carpet (could be either side), behind the glove box or tucked behind (in front of in both of these cases, technically, when referring to toward the front of the car) the panel on the back of your front seats if you have a trim package that does not feature a front bench seat. Other than that, you can date code your engine, but that's usually several months earlier than the car's build date. In my '66 I also found a metal tag with a date code on it attached to the upholstery springs inside the center console armrest between my front seats. I haven't looked to compare that date with the build sheet date yet, so we'll see what that tag means, if anything. -- David '91 K-Imperial driver '66 Crown Coupe project '66 Newport 383 dual exhaust .030 over Eddys/Hurst/Cragars daughter's first Mopar