Stacking aluminum lowering block?

I'm looking at an A body 8.75, with 5x4.5 Strange axels with 3" studs, backing plates, brake shoes and hardware. It comes with springs but no chunk. The seller wants 1k. Knowing what I know now...which really isn't much and having a 68/70 B body 8.75 and stock A body 8.75, both of which are missing the axels and brake parts. I have a 489 case with 4:10 Sure Grip, which I might swap to 3.55 which I like in my 4 speed car, but not so much in the auto. I'm also thinking of some 3.23 also. This is for a 72 slant 6/904 Demon that needs and overhaul.
I'm liking the idea of rebuilding that setup with some more power and some trick slant 6 stuff.
I'm liking the enki wheels that Blu is running on his rig. This all being said,
Which give more bang for the buck?
Thanks