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

thanks guys, so much good info its hard to know what to do, especially when the prices are broken down for me like that and I can see how expensive it is! I'm heading to the junkyard now to see if I can find a suitable b-body rear end, or maybe see if I can find a donor diplomat. If I end up finding the b-body rear, is the 8 3/4 that I have just a waste of metal to keep then?:burnout: