1966 Dodge Dart GT - Trying to Determine How Rare

8.75 a stock, from the factory rear end? Or was it added. Very rare in a 273 car. IMO. A legit charger 4bbl 273 from factory is rare. again IMO. Mostly 2BBL engines.
Most 273/235’s with automatics got the 7.25; 4 speeds the 8.75


I see someone added side marker lights and a custom grille with auxiliary lights. Will they hurt value? To a purist - probably