my car is crooked

[speedshftr]

its off over an inch from one side to the other.im guessing bad accident repairs in the past.im wanting to go to a four link rear.does the four link incorporate the factory rear frame on a camaro?or ?im really liking those fab 9 setups.im thinking if rear frame rails are still used my cr may have to go on frame machine.it drives straight and true just sits uneven.