How Rare? 1976 Dart Lite

A 4 spd for a slant engine sounds rare, but I know nothing, especially about 1976. If an aluminum case that would be desireable regardless. It would be neat to fool w/ a Dart Lite to push for mileage. I think adding MPFI, wideband O2, and more modern ignition (knock sensor feedback), one could get 35 mpg hwy w/ a slant.