Putting a late model 8 1/4 Jeep rear end in a 66 Dart

Rear disc brakes are nice shiny objects that people think they need on a light A body. If you simply WANT them, because all the magazines and forums say it, that's one thing, but are they NEEDED on a light as a feather A body? No.
Thanks for the insights. The rear discs were a bonus actually. I am swapping the 273 for a 360. Nothing too crazy but at the end of the day, the hope would be around 375hp and 365 lbs of torque so the stock 7 1/4 just seems like a bad idea. The strength and bigger bolt pattern were the real goal.
Thanks for the insights and opinions. Much appreciated.