All V8 4th Gens came stock with the posi rear axle. "Posi" is just a GM name for a limited slip rear. To verify, you should be able to find "G92" on the build tag.
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Fred
1994 Formula - 381ci / 300-shot N2O / TH400 / Gear Vendor OD / Strange 12-bolt 4.11 - 11.5@117 on straight motor
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