In a perfect world, and according to GM specs, the Trans Am is 250 pounds heavier than a Firebird 400. I believe that nullifies the 2-3 mph that the Trans Am would have gained. You have the SAME motor, nothing extra. Sure the aerodynamics will assist, but there has to be accountability for the added weight. I am quoting GM's T/A and Firebird 400 weight figures.
2.5 to 3/10th's of a second en ET is close to or nullifying any aerodynamic advantage in the 1/4 mile. Longer distances, maybe.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
