1966 Dodge Dart GT - Trying to Determine How Rare

Mopar Tim said
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.

Thank you. We believe the 8.75 is from factory but difficult to prove. Confirmed it did leave factory with 4bbl though.