▁cars ▁with ▁A / C . ▁ ▁Optional ▁ 3 . 9 1 ▁g ears ▁were ▁available ▁only ▁for ▁non - A / C ▁cars . ▁ ▁The ▁Hur st / Old s ▁was ▁tempor arily ▁dropped ▁after ▁the ▁ 1 9 6 9 ▁model ▁year ▁because ▁G M ▁dropped ▁the ▁ 4 0 0 ▁cub ic - inch ▁engine ▁limit ▁for ▁the ▁ 1 9 7 0 ▁model ▁year , ▁which ▁permitted ▁the ▁divisions ▁to ▁install ▁larger ▁engines ▁in ▁their ▁intermediate ▁mus cle c ars . ▁For ▁ 1 9 7 0 , ▁the ▁regular ▁ 4 4 2 ▁came ▁standard ▁with ▁a ▁ 3 6 5 - hor se power ▁ 4 5 5 ▁Ro cket ▁V 8 , ▁or ▁an ▁optional ▁ ▁W - 3 0 ▁version ▁of ▁same ▁engine . ▁For ▁ 1 9 7 0 , ▁Old s ▁planned ▁to ▁bring ▁back ▁the ▁Hur st / Old s , ▁but ▁as ▁a ▁lower - pr iced ▁companion ▁to ▁the ▁ 4 4 2 ▁with ▁a ▁smaller ▁ 3 5 0 ▁cub ic - inch ▁V 8 ▁and ▁special ▁graphics . ▁That ▁planned ▁' 7 0 ▁H / O ▁ended ▁up ▁being ▁introduced ▁as ▁the ▁mid - year ▁R ally e ▁ 3 5 0 , ▁which ▁featured ▁a ▁bright ▁yellow ▁paint ▁scheme ▁for ▁the ▁body ▁along ▁with ▁front ▁and ▁rear ▁b ump ers ▁co ated ▁with ▁matching ▁yellow ▁u re th ane . ▁The ▁next ▁Hur st / Old s ▁would ▁be ▁introduced ▁as ▁a ▁ 1 9