Let me clarify my statement on Mopar not doing any wind tunnel tests on the 1969 Dodge Charger 500.
I was told by Richard Pettys Brother in 1998 or maybe late 1997 that Richard had wanted to race one of the 1969 Dodge Daytona Chargers for the 1969 season, he was told that they, the Mopar race gods, wouldn't let him do that so he raced for Ford in 1969. As a result of that change Plymouth came out with the 1970 Superbird and Richard came back to race one of them (probably more than one of them) for the 1970 season