8.25 rear end swap in 66 dart

Hey all, I found a 73 Valiant parts car with a 273 for about 500$. Im assuming since it has the 273, it also has an 8.25 rear and disc brakes. What is required to swap the rear end and brakes from the Valiant into my /6 66' Dart? How difficult would it be for someone with little experience such as myself? Is it even worth swapping a 8.25 rear and power disc brakes into a mildly built NA slant?