i'm of the same thought. not only unrestored but also original owner is near unheard of. you know the history of the car, you know where the car has been the last 50 years, no questionable timeline.
that alone puts this in a different class.
add in hemi + 4spd high option numbers car and that's easy 7 figures
i paid a premium for my barracuda damn near 30 years ago because i knew the family i was buying it from, meticulous paperwork detailing all of the work done to the car and had the timeline on it back into the 70's. i would think something like that would have even more value today and figure into a higher figure for an already rare car.