Maybe the 3.9L DOHC, you are saying, is more effecient than the 4.6 SOHC?
Anyways, I hope it puts out more hp than that if it does go into the GT. But, from what I've read elsewhere, it will not be used in the GT but the GT will be the new S197 chassis.
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1996 Mustang GTS <---Must sell. $10,900 obo 56,000 miles