Curious if a 1980 f body rearend will fit a 72-74 Dart?
And the locator holes in the perches are HUGE (due to the goofy iso-clamp mounting) and don't properly locate the perches on the A body springs. To properly mount it, you'd need to cut off the F body perches and weld on some standard perches in the correct locations.
If you still want to undertake it, make sure it's not a 7.25 rear, not worth the effort. You can get actual A body 7.25s for a song. Or at least hum a few bars...