Sorry about bumping an old thread, but I got some info that is useful.
I have a 1996 2WD Silvy ECSB, I installed the 4" CanuckMotorsport's spindles (little cheaper then RC) and have a 4" rear block because the truck was lowered 2" via shackle.
The spindles gave me more lift then advertised, about 5-5.5"!, I love the lift, and 15" rims do fit, I currently have 31x10.5's on 15x8 Appliance Steel Spokes, some factory rims won't fit, they hit the spindles.
I will be using 32x11.5 MTR's on 15x8 73-87 Rallys in spring.
Also, the spindles push out the wheels about 2" farther.
Before lift (31's and 2" lowering shackle):
After:
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