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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I believe the highest output fiero motor is like 140 hp, nothing to brag about. But the 85 mustang's were rated at only 200 hp i think? Anyways, your car should be faster, but it also depends on who's engine is in better shape. My 90 hp cavalier smoked my friends V8 oldsmobile cutlass sierra because his car had some serious problems with either its engine or tranny.