Andy,
there is a lot of discussion in All Cobra Talk
http://www.clubcobra.com/forums/show...threadid=10206
(doubters of the 485 hp Cobra)
about drag, frontal area and hp. Look at the last pages.
Bob Johnson told me at the 95 convention that raking the 289 windshield alone resulted in 500 to 800 rpm in last gear.
Of course not if you hit redline before.
I found 16.6 sqft of frontal area in an old british car magazine.
Still got no confirmation about the Cd of 0.64.
Dominik