273 Carb upgrade

Just be careful of that early intake bolt angle. Being it is a 2 year run thing, aluminum intakes could be a pain to find. IDK

ALSO! A 500 cfm Carter/Edelbrock would be very good on top. I myself would use the new AVS II 500 cfm unit.
Are you saying that a 1966 273 is different a later year 273/318/340/360?