Alignment off after rear-end swap

[Ricks72Chlgr440]

I have a 72 Challenger that I just replaced the leaf springs (with ESPO 6 leaf) and swapped the OE 8.75 with a Dana 60. Before the swap, the car alignment was perfect. After the swap the car wanders to the right. I'm pretty sure what is happening is the rear geometry is now off. Since it now wants to wander to the right, thinking I need to put a shim on the right side (front) mounting bracket to push the leaf spring a bit aft. The rear brakes are adjusted properly and not dragging. Any thoughts?

 

[Chryco Psycho]

If you loosen the the U bolts the rear should shift slightly on the springs or a shim in the front mount cn work .

 

[Ricks72Chlgr440]

If you loosen the the U bolts the rear should shift slightly on the springs or a shim in the front mount cn work .

Hmmm, did not think about losening the ubolts and shifting the rear. I assume that's done with the rear up in the air so the weight is off of it?