If you do the brakes and they are the original style 10" drums all the way around, the 68 drums had the lower spring that goes from the primary shoe to the secondary shoe attaching to the adjusting lever for the star wheel. I don't like having that much force on the star wheel adjusting lever. You can convert "both axles" to the newer style, front and rear...
I like to convert to the later style where the lower spring goes from one shoe to the other and the adjusting lever is separate from the much stronger lower spring for the shoes.
Go to the parts store and order the complete parts for a 72 Duster with a v-8 and 10" brakes. You will need to get the hardware kit for both sides, the spring kit, and the proper shoes. That's all that you will need to convert each axle front and rear, and not very expensive. It will "bolt right up" and I like that system much better as it keeps the higher load spring for the bottom of the shoes off of the star wheel adjusting lever.
If you need pictures of how the 72 system goes together, let me know, we just finished the rear axle for my son's 71 Valiant 4 door with that brake system on it and I can post some pictures to help you get it together...
