Brake upgrade, from 9″ drums to 11″

As a result of a diff and housing change, I am upgrading my rear drum brakes from the old 9" drum brakes on the 7" diff housing to 11" drums on an 8.75 housing which Im fitting.

Will my current master cylinder (std 1972 power brake A Body) handle the increased pressure requirements of the 11" drums, and larger slave cylinders?

Is there anything that might be a problem with the brake lines or system with this change over?
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