Rear suspension setups

A couple of options come to mind.
Get your springs de-arched.
Flip your front spring hangers upside-down, it'll gain you a couple inches.
An adjustable pinion snubber is needed for SS springs (as well as longer shocks or shock extensions).
A spring relocation kit (as you know) is the only option to fully utilize the wheel tub.
The Hotchkiss rear sway bar won't fit with a spring relocation kit installed.