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MGB Brakes scrapping sound from rear brakes on hard left or right turn. New wheel cyl, drums shoes ?

scrapping sound from rear brakes on hard left or right turn.
New drums shoes and cyl ?
My first gut reaction is either worn bearings allowing the axle shafts to move in and out, or weak springs allowing the entire rear end to shift side to side.

The only way that should be able to happen is if something is shifting from side to side, or if your springs are weak enough to allow the rubber to rub on the inside of the wheel wells....either case is not good. I'd lift both rear wheels off the ground with a jackstand under each side at the axle spring mount, and see if there is any in/out movement on the wheels. Also once you have it safely on the jackstands, look at the inside of the wheels for any scraped away dirt or shiny metal that would indicate something touching the rotating wheel/drum assembly from the inside. Look for any spots inside the wheel well where the tire could have rubbed against the metal? Are you running unusally wide tires on the back? Nothing inside the drum should be changing geometry in relation to the drum itself unless there is excessive play in the bearings which should be revealed if the wheels can move in and out, If you still can't find anything loose or rubbing, you'll have to pull the drums and look for wear marks inside - usually problems inside there are evident regardless of turning or not but stranger things have been known to happen.
 
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