Like any head, polish the ports.
Those are actually a nice, inexpensive upgrade for a 302. They used to come on Explorers that had the 302 in them. It basically upgrades the heads for a GT to be similar to a Cobra.
Also, if you can get GT40 the upper and lower intake from the Explorer you will be getting basically what came in the Cobra, too. Another "cheap" upgrade.
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1994 Ford Mustang GT
1990 Ford F-150
2001 Lincoln LS V8
1970 Ford Bronco
2006 Harley-Davidson Sportster Custom
1990 Ford Bronco II
If you don't already own a Ford (or Ford owned product), get one.
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