Use standard backspacing. As for lift brand, I would choose Tuff Country, as their spring rates are less than the Rough Countrys which ride RUFF!!! Check out Off Road Design, they sell the TC front springs for like $200, and the rears for $360.
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ken
'58 Chev NAPCO 4x4 short
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'90 Chev Suburban 4x4, dually, ZZ502
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'79 Chev 3/4 Suburban 4x4, 400-400-203
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