Rene, go with alum lowering blocks, some have a degree adjustment already built in so your pinion angle does not get impacted. I do not see any issues with lowering blocks, and a good way to dial things up. I am seeing guys here buying different sets of leaf springs all the time because they either sat too high or too low, so the blocks will definitely be a inexpensive and easy option to dial in stance until you swap your springs. Also note there are steel blocks that can be tack welded on the mounts if you chose to stick with blocks.
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