4-Door with 340 from the factory?

Shows you how smart we are (were) nobody bothered to photograph these unicorns? Or their paperwork,
VIN tags, etc? Today I would hope somebody would get out their phone! I'm as guilty as the rest. I remember in the early '70s in Piedmont area NC seeing Duster or Demon A bodies with the T/A "340 six pak"
stickers on the fenders. Now in my defense, I was not a car guy and wasn't driving myself, yet. I feel like I saw more than one. Looking back now, I assume a dealer was selling the parts, or doing the conversions. But who knows? Made a strong impression on me, for sure!