Rear disc Brakes on 8 3/4

Nice work !
Would you tell me which axle are you using ? I need the Hub and flange diameters to help clarify things.

I'm not a brake guy, so could you explain the Parking Brake hook up with pictures. Overall I think it would help everybody.

I am about to change my ABody Duster to the 4.5" pattern with new axles and was looking at the different Disc set ups, so this may be perfect timing for me, if it works out.

I can't take anything for granted with this 70 Duster.

I might suggest, that you get a donor car to show off your work.