Drum Brakes Sticking

Update: Welp finally bought new lines front and back and now the brakes no longer stick and are properly distributing fluid! So happy and it's getting on the path to being my daily driver again!

New worry/issue: When i start on a striaght away or make a deep left or right turn, the right rear of the car sounds like a grinding noise when pressure/weight is being put on it. On straight aways it makes this noise a bit more silently, but it stops making the noise once i get a steady speed. Any ideas if this is a big issue happening yes?