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I heard a story that the Sbird/Daytona wings didnt do much tiil around 100 MPH,, but at 200 MPH they produced 600 FT LBS of down force..
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What I've read is it was the bad aero of the 68 B bodies that led to the Wing cars. Richard Petty built a 68 RR racecar and was testing at Daytona. When he shut it off on the back stretch for plug check, it didn't even make it around to the pits coasting. They knew they had aero problems then. IN addition to the wing, the nose of the wing cars is what they needed.
On a simliar note, I read somewhere in the past that on a typical fully winged Indy style car, if shut off at high speed will deaccellerate at a 1G rate from all the induced drag from the bodywork/wings, since in their case downforce is so much more important then reduced drag numbers. 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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