rest s , ▁and ▁a ▁Hur st / Old s ▁em blem ▁on ▁the ▁glo ve - box ▁door . ▁ ▁The ▁non - drive ▁train ▁modifications ▁were ▁again ▁done ▁at ▁Dem mer ▁Engineering . ▁ ▁Appro xim ately ▁ 9 1 3 ▁cars ▁were ▁built ▁including ▁ 2 ▁convert ibles ▁for ▁Hur st ▁prom ot ional ▁use , ▁one ▁for ▁East ▁coast ▁events ▁and ▁one ▁for ▁West ▁coast ▁events ( a ▁third ▁was ▁built ▁after ▁one ▁of ▁the ▁original ▁two ▁was ▁destroyed ). ▁ ▁The ▁ 4 5 5 ▁cub ic - inch ▁Ro cket ▁V 8 ▁( W 4 6 ) ▁was ▁r ated ▁at ▁ ▁and ▁ 5 0 0 ▁lb / ft ▁of ▁tor que . ▁This ▁is ▁the ▁same ▁engine ▁as ▁A / C ▁equ ipped ▁ 6 8 ▁Hur st ▁Old s ' ▁and ▁provided ▁better ▁driv ability . ▁The ▁same ▁engine ▁was ▁used ▁for ▁both ▁A / C ▁and ▁non - A / C ▁cars . ▁ ▁The ▁engine ▁received ▁a ▁unique ▁int ake ▁manifold , ▁chrome ▁steel ▁val ve ▁covers , ▁and ▁a ▁special ▁vac u um ▁operated ▁air ▁cleaner ▁lid ▁to ▁allow ▁cold ▁air ▁from ▁the ▁h ood ▁sc oop ▁into ▁the ▁car b ure tor . ▁ ▁This ▁was ▁back ed ▁up ▁by ▁a ▁spe cially ▁cal ibr ated ▁code ▁O H ▁Tur bo ▁ 4 0 0 ▁transmission ▁and ▁ 3 . 4 2 ▁g ears ▁for ▁non - A / C ▁cars ▁or ▁ 3 . 0 8 ▁g ears ▁for