I would doubt that it is a BOSS block, but you never know.
The easiest way to tell a BOSS block is that it has screw in freeze plugs...weird but true!
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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