[A1971Blazer]

There may be a few more but....here's a few considerations:
Unless you're going with bigger tires and more mods...spend the money on something else....the front disc brakes do 80% of the stopping......stock or near stock...drums are fine...but:

If you use the stock axle with a kit, You will have to address e-brake if you want one...... if you swap in a later model with the disc and e-brake already on it....it may not clear the factory wheels...