You'll need a 21-tooth white gear.
With your setup and a Tremec 3550, you would need the 20-tooth black gear.
Hope this helps.
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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