70 duster 8 3/4 conversion to 4.5 drum or disk hardware

8.25 is a good rear. you will need to move the spring perches and get wheels with deeper back space to run it under your car.

or just snipe it for the brakes,

i wouldn't buy the whole car unless parting is your thing. in the end its just less time working on the car you would other wise want to be driving.