Drop Springs - '68 C10

[OregonNed]

Thought I would ask this question here.
Scenario - my '68 C10, trailing arm and coil rear suspension.
Had a 4/5 drop done recently - in the rear, a combination of 2" blocks and 3" CPP lowering springs. Been driven 150 miles or more so far, so I would assume any settling in is done. Work was done locally. The driver side from ground to top of the wheel arch has about one inch more height than the passenger side.
Not knowing much about springs personally, does the way they are installed have anything to do with this? Can rears be installed differently, or rotated to make the sides match? I know the fronts seat into pockets on the lower control arm. Posed this question a few places. I notice on the summit site the specs shows this spring lowers in a range, so wasn't sure if that meant they can be seated different ways. Thanks in advance, appreciate your patience with my lack of knowledge...