1968 Barracuda data plate decoding?

I have a couple of contributions.

The 9 under the 1 is Custom Sill Moldings. These are the gills and spears, available as a stand alone option, and also was part of the Spring Special package. They are clearly seen on the photo of the car in your avatar.

The 8 under the E is for code 368, Spring Sport Special.

a-6 console
b-4 bucket seats
m-6 driver's outside remote operated mirror.