You have to understand collector car "status" is in the details. Is this an LO23D 1966 "D" Dart" Presumably, as long as the VIN is not altered. Would Govier certify it as an original? Most certainly, as in "this is an original D Dart of which only 50 were produced".
Does it have the correct drive-train? That's open for debate. But it does appear it is an original D Dart whether it has a slant 6 or a 426 Hemi under the hood is a point that takes away value.
My prediction was about $20K and a no sale. I got the no sale part right but never imagined it would be that high. I would suspect shill bidding. Happens all the time.