There are guys on this site that have had good results with mods and speed density (88workcar, Dark 5.0, et al), however, I would take the lazy way out and convert to mass-air. Sure, it might cost you a few HP, but it will accept just about every mod you throw at it.
I agree with the comments above about the GT-40 vs. Cobra intake.
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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