The flapper wing that is shown was something that Hurst wanted to do to help in braking. The wing would only flap up when the brakes were applied.
Hurst also wanted to go with the Hurst Gold and black stripes for the '68 (that is the color my buddies convertable is ) but, it was too large a metalflake for the guns in the spraybooth to shoot (and I am imagining that would mottle like a B!tch) so they shot Peruvian Silver and black stripes. The Peruvian Silver was a Toronado only color. It is very easy to find and verify a '68 H/O because of the color code on the trim tag.
All of the '68 and '69 cars were assembled on the line at Lansing and finished at Demmer engineering. This was because of the extra work necessary on these cars but it also gave the credience that the engine swap was going on there and not on the line (remember, GM had the rule of nothing more that 400 cubes in an A body) And to tell the truth, the engines were installed on the line!!