Rear end alignment issue 1969 cuda

Guys, one of my friends was following me and noticed my car was tracking crooked down the road. We looked at the rear wheels and noticed the front of the driver side rear wheel was about 1 inch closer to the front of the wheel opening than the passenger side.

I have been unable to figure out what is going on. Things I have tried so far:

1. I measured from where the front spring bracket attaches to the frame to the front of the spring perch on the 8 3/4 rearend. The measurement on the drivers side is one inch less than the passenger side, which makes sense with the wheel to fender measurement.

2. I took the u bolts loose on the driver side and confirmed that the the peg bolt in the springs was located in the hole in the spring perch on the rear end. Didn’t do the passenger side yet. The spring locating bolts / nuts that stick through the shock mounting plate on the bottom of the housing look centered to the axle housing.

3. I measured the forward spring mounting bracket to the torsion bar crossmember, they were within 1/4 inch. I also did an “x” measurement to determine if the torsion bar crossmember to the front spring mount was square. It was very close.

After all this it looks like the issue is that the center line of the rearend is one inch closer to the forward spring mount on the drivers side, although I don’t know which (or maybe both) are off.

The springs are different fron side to side. They are 6-7 leaf springs, I have attached pictures. I have read here that super stock springs are different from side to side, I don’t know if this is what I have. Could i have mismatched springs? The car was restored 10-15 years ago & looks like drivetrain was swapped out. I have had it about a year.

How could the springs be that far off, or am I missing something? Could difference in spring arches cause this?

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