If that '71 LS6 were my car, I'd never have had it done, and if I bought it later, I'd be spending my spare time cleaning it off.
I was trying to determine if I should recommend to the owner that he get it cleaned off (I doubt he's the sort of person to do it himself). I think it's a detriment to any future sale, and to having the car judged at a high level. Otherwise, beyond the Ziebart and the minor mods, the car is very well preserved, but not *clean*.. cleaning most of it is not difficult, but the Ziebart is another matter. The interior (if it were detailed) is probably a 2+, and the original paint could be a 1 or 1- with some detailing.