No, they MIGHT ride a teeny tiny bit better, but you probably won't even notice. It was GMs way of (a) cutting a little of harshness out of the ride of the truck and (b) making 8 less places to have to grease on the newer trucks.
For my money, I'd continue to use the 71 stuff. It should already have disc brakes, being a 71, so there is nothing really to gain by changing the parts to newer ones.
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