See what G&D recommend before anything else. How big is your cam?
As Stav was saying, make sure the condition of the rest of your engine is in good nick. With a larger cam, your engine will be less tolerant of things like worn plugs, leads, injector O-rings, inlet gasket leaks etc....
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AU XR8 Ute 13.90 @ 100mph - http://www.aufalcon.com/xr8ute
5L Windsor, GT40X heads, Crane 2030, Pacey 4-1s, Lukey 3", 3.91:1, auto. Tuned by me w/Quarterhorse and BinaryEditor.
Coming Soon: Ported lower intake, Tickford "Premium" Brakes, and a good wash.
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