Dodge Dart Sport

Welcome to the site. I am the original owner of my 1976 Dart Sport and the 360 is a mighty fine engine in my opinion but I am biast because that is what I have in mine.
Sorry to say but that 8 1/2 rear end is either an 8 1/4 or an 8 3/4.
Also in case you did not know: at first there was the Dodge Demon and the Plymouth Duster. But after much complaints of the name Demon from the American religious groups, Chrysler changed the name Demon to Dart Sport from 1973 to 1976.