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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.
300 at the flywheel or rear wheels? Either way this a fairly easy task with todays bolt on parts. I am pretty sure that the first thing you are going to need to do is change to mass air from speed density. Then start with exhaust, gears, intake trac (throttle body, mass air meter, cai etc.), then go with the HCI.