1964 GMC rear brake Dana 44 *Help*

[Sixduce]

I recently purchased a 1964 GMC with rear leaf spring suspension. After going through the truck, I realized that their are no rear brakes on this truck. Am I screwed? I have read topics on the Dana 44 rear brakes on this site for hours. The problem is, all I have are backing plates with nothing else. Is there a loaded drum brake from another truck I could use? Am I better off swapping the rear end out of a Chevrolet and dealing with the mounting? Thanks in advance. Any direction will be greatly appreciated.
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