1968 barracuda factory color question (red)

It should be located on the drivers side of the car on the inner fender
near the battery , I am posting a picture of mine.
It has tons of info about your car. Just post a picture of yours
and some one will decode it for you.
Check the glove box see if it is loose in there.
Build sheets are located under the back seat tucked up in the
wire spring under side of the seat.

Cheers.