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
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