I'm pretty sure the 1970 455 HO 4SPD with ram air had a 7040279 quadrajet. Only the RAIII and RAIV 400 4SPD got the 7040273. The cars that received the 7040273 and 7040270 quadrajets also had the ram air exhaust manifolds. As far as I know, the 1970 455 HO In the GTO had standard log exhaust manifolds.
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