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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.
GT-40Ps outflow 40s a nice bit, however you do need special headers I believe, although I'm not 100% sure on this. The aluminum GT-40X303s outflow the Ps, but only marginally so.
Depends on the condition. I paid $300 for my GT40Ps, and $150 for an Explorer upper and lower intake. $550 might be a little on the high side?. Several sets on ebay, also look here and in the Corral Classifieds