There are two ways.
1. Get someone to reflash your chip. Kind or risky though, as if they screw up, you're toast.
2.
www.uprproducts.com They have a timing adjuster which is similar to the old style Steeda unit, and easier to use than the new steeda one. And its only $100 shipped. At least mine was.
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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13