Check out this 66 D-Dart For Sale on eBay

Saw the car first hand in Seattle two summers ago. It was with ddartdude's white 66 D/Dart. Thought the race car was the better of the two. Dealer owned both cars. The owner told me they took the spare engine that cae with the white Dart and used that in the race car. It's my understanding that ddartdude the original 273 went with the white D/dart.
They wanted 45K for each car. That race car would meake a great Bonneville car.

As far as the body plugs, I belive SCCA allows the sealing of the plastic body plugs thus that is why they are painted.