I've never seen the "SPEC" paint code.  I'd bet with the car in such untouched shape, your build sheet is probably in there somewhere, and that would give you the exact info you're looking for.  It is usually found attached to the top of the gas tank.  So if you feel like dropping it, you may find it.  Just be REALLY careful with it if it is there. It will likely be very brittle.  You're best bet, if it is there and legible, is to just take pictures of it with your digital camera to make sure you preserve it's image before you try to touch it.

Let us know if you find it and what it says.