manual brake shake boogie...

OBTW, some other things to check:
1. The primary shoes are the shorter shoes and always go to the front. There should be a primary and a secondary shoe at each wheel.
2. Sand/file a little bevel on the leading edge (as the drum normally rotates) of each shoe's brake materials.
3. Make sure the shoes are the right width; they should cover about 85-90% of the width of the inside drum surface.
4. Make sure the shoes and drums are completely cleaned with Brake-kleen.
5. Make sure you find a diagram of the spring arrangement and see if the springs are installed right.

All simple stiff, but IMO it needs complete work over.