1975 Charger Drivetrain Into A 1973 Duster?

The 75 Charger has a 400 2bbl with a 727 with a 9 1/4 rearend. Will at least the rear end bolt right in or iis it to wide? Would I only have to change the K frame to stuff the big block in? What else would need to be done to put the drivetrain in?
Thanks Emilio