I'd ditch the gt-40 swirls for a set of AFR 185's or the 'new' trick flow high port street heat heads.
Also, what compression ratio are you looking for? That will make alot of difference on the power output.
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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