1966 Hemi 4 door ?
Ma Mopar made alot of things that never were. I guess if the right boxes were checked off on the order sheet,, they would build it.
Since we are into A bodies, Only once in Denver did I see a 67 Dart 273 hypo 4 door. The car was not restored and the owner had the paperwork/buildsheet with the car. It was for sale at a swap meet back in 2000.