I agree with Wade.
As for the heads, to get the most out of them, I would have them ported - favoring the exhaust side. Trick flow, Canfield's, etc. should all work well.
Good luck,
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'
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