It may be someone has put leaf springs from a late model (72-74 I think) Nova under your car.
The Nova springs are longer and will raise the rear end as it appears your car is higher than stock. They will bolt in, but are a bear to bend to install. Measure the length of the springs and compare to stock.
Also check the eyes at the front of the spring as others have suggested - very common failure.
The Nova springs are longer and will raise the rear end as it appears your car is higher than stock. They will bolt in, but are a bear to bend to install. Measure the length of the springs and compare to stock.
Also check the eyes at the front of the spring as others have suggested - very common failure.