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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 don't know about the speed density stuff, but check out www.tweecer.com
It's not easy by any stretch of the imagination - just ask vfast but given time and a certain amount of computer proficiency (and patience) you can really dial it in well.
I need a wideband O2 and I'll start messing with mine more.