Strange situation on rear brakes - 67 Barracuda

Alright... I removed the washers and replaced the drum. It rubs as expected, but just barely as seen by the shiny parts of the drum and backing plate. I think I'm egoing to grind down the ridge on the backing plate until it stops rubbing. OR - Does anyone think I can buy all parts necessary to replace these drums/shoes that would work with my current backing plates?

By the way - thanks for taking the time to give me input.