Super Six 2bbl or Hyper-Pak 4bbl in 270 Dart w/225ci

The car is automatic 3 speed. I believe the carb is still completely original.
know going in that anything you change or modify WRT the carb linkage/operation you will need to address the transmission kickdown. failure to do so will wreck the transmission.

verify the carb, intake and throttle actuation (cable v rod). a lot can change in 50 years.