Blocks are the easiest means of lowering. There also are two position front hangers, rear sliders, and leaf with minimum to zero arch and alternate eye mounts that can work together to achieve a drop. For instance, Hotchkis uses an alternate front hanger that reduces height .75" and combine it with a berlin eye spring with .75" to achieve a 1.5" overall drop.
You may need to add a pinion angle shim. Depends on how far out you end up from where you started.