I think Pontiac should have use The round ports in the GTO and the Tans AM Grand Prixs and "D" ports in wagons Bonniville, ect.
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Conrad
79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear.  ECMTTFMFers. IHTTFMFers.
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