Spacer plate in front of leaf spring hanger

As the others have said I doubt the factory would put such a hacked up piece in it. But I have seen all kinds of hacked up things like that installed by shade tree mechanics.

Incidentally the factory 8-3/4 rearend in my 68 Cuda was off about 1/8" but I never noticed it dog walking when I'd follow behind with my wife driving it. What I did notice is one side was closer to the tire than the other. I put a spacer in it and now the back wheels are even side to side and are right in line with the front wheels