A real plus is finding the original broadcast sheet somewhere in the car. Most are found under the rear seat cushion, under the carpet or above the glove box. This sheet will provide you with information the assembly line used when building the car at the factory. If you happen to find it, post a copy and FABO members can decode it for you.
The metal fender tag (driver side inner fender panel-you posted this) and Certicard, if it has survived, is housed in a plastic holder located on the passenger side inner fender.
Both of these items offer small amounts of information, but are valuable just the same.
I don't think a lot of these cars came with the optional fast ratio manual steering. The broadcast sheet will show whether it did or didn't, but you will know immediately if it has a fast ratio box from the heavy steering effort needed at low speeds (or parking).
Just a detail I noticed from your fender tag and console pictures. In 1966, when a Barracuda was ordered with a radio, the fender tag would have the number "1" stamped under large "R" indicating an AM radio. Your fender tag has no number under the "R" and I think I know why. The AM/FM radio was available but only as a dealer installed option. I think your car was ordered sans the radio and when the car arrived at the dealership the new owner paid the dealer to upgrade. The fuzzy picture of your radio appears to be a AM/FM model and if so, consider yourself very fortunate. These are now expensive and fairly rare. If it's AM, well I've missed again.
Anyway, I have a 66 Formula S with the fast ratio steering, so I do know about the steering effort.
Good luck....these are neat and fun cars to drive.
