S/s Springs Relocated / Pinion Angle?

[396PLYMOUTH]

Hey guy's the car I have was set up like this when I aquired it, s/s springs relocated inward 3 inches. Now the original 7.25 rear is still in the car just to roll it around, I want to swap it for a 8.25 obviously new perches need to be installed and so on... My question is has anyone here ever had to re-adjust pinion angle after having s/s springs installed? If so any tips would be great thanks in advance.:burnout:

 

[evanbrendel]

on my belvedere i tryed angle shims and they wherent enough i cut the perches and turned it and welded them use an angle finder i did 4 degrees down on the rear from the driveshaft.