The bores on the throttle bodies are bigger for the higher HP models too. I think the standard one is 900cfm, and the larger ones 1250cfm, and 1375cfm for the largest ones, but would have to check to be sure on exact cfms.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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