you're screwed.
Sorry, but unless you dropped a KB blower on the motor, your hurting for 400bhp.
You could get a DOHC 5.4 dropped in, they make about that much with the right tune. The 4.6 just doesn't have the aftermarket support to get that much power n/a yet.
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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
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