Rear end alignment issue 1969 cuda

After having messed around trying to make "bastard pack" leaf springs I have something that kinda works but I don't really know the rates especially compared to the arch and the packs I picked from the junkyard had 2 slightly different thicknesses of the individual leaves even though they were the correct length and the arch "looked" close enough...

Point being, get some new spring packs from a good source. I plan on getting new ones for my Duster at some point. It's one of those things that seems to work OK until you get the "proper" setup and it's like daaang that's what my car is SUPPOSED to drive like! I realized that when I first rebuilt the front end with stiffer torsion bars and offset UCA bushings for more caster, then again when I installed adjustable strut rods (and still plenty more upgrades planned). The improvements you can make with simple suspension mods (changing spring and shock rates, better bushings, stronger parts) on these cars is pretty drastic especially when starting from bone-stock.