Here is a pictorial drag table based upon data presented in the SAE Paper identified on the image header.
I deleted the Daytona's rear wing/vertical stabilizer and adjusted the Cds accordingly.
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The backlight research was actually conducted on the 1969 'RACE' Charger,which was carried onto the follow-on Daytona for the 1970 NASCAR season.
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*The center image reflects the actual homologation production Dodge Charger Daytona/Plymouth Roadrunner 'Superbird,utilizing a 22-degree backlight angle.
*The 18-degree backlight had the lowest drag but did not produce the negative lift of the 22-degree 'compromise' configuration,do to the C-Pillar architecture specific to the Charger/Roadrunner.
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*In all configurations,the roof-to-boot angle remains approx. 15.5-degrees.
*The drag varies with downwash/sidewash interaction particular to each configuration of the notchback.
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The Daytona 'package' produced a 16% drag reduction over the 1969 'RACE' Charger,and reduced the Road Horsepower at 190-200-mph,by 85-hp,giving about a 5-mpg 'lap' speed increase.On a straight course the car was capable of speeds in excess of 220-mph.
