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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 it. I adjusted my timing from 6 to 14, and think I gained an honest 15-20 hp...seriously.
That sounds about right. Most sources say that on average, you gain 3 - 4 HP per degree of timing (to a certain extent.) So if you advanced it 8 degrees, I would have estimated the gains to be 24 - 32 HP or so. Of course, I always lean towards the lower number.