From what I have read this was a ploy used by Pontiac on the 1967 through 1969 Firebirds, including the '69 Trans Am, to keep power to weight ratios in line with Federal guidelines/regulations. On the '69 T/A it was a little threaded pin on the linkage side of the carb. Unscrew the little bugger and there you go, WOT.
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"Stupidity is infinite, Wisdom is not"
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