The 4.2 is a v6. They offer all kinds of motors in the f-150's. I am not sure about the hp ratings on the sixes. I do know that the f-150's are pretty f'in quick though. My dad has one with a 5.4 in it with a cold air kit, it books
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1988 Mustang 5.0 LX Convertible
-Mac Cold Air Intake
-K&N Cone Filter
-9mm FMS Spark Plug Wires
-Hedmann Headers 2.5" O/R H-Pipe
-Flowmaster 40 series 2.5" Catback