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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.
get a set of aluminum heads and you'll find you can run more compression...I ran a .200 dome piston on 58cc alum heads making about 11 to 1 on 93 octane and never had detonation once
I have a -5cc flat top, 52cc head, .039 compressed gasket, about .010 in the hole, with a 3.25 stroke and 3.030 bore. it comes out to like 10.7:1
i ran either 91 or 93 and a total of 29* so far. spark is kinda low but i havent tuned it yet.
Way too many variables to say. How aggressive will the tune be, what's the quench, what type of piston, what quality piston, chamber shape, cam timing, intake, exhaust etc etc. Also how much margin for error do you want? Running it on the edge works fine and all, until you get some bad gas or a lazy trucker puts 87 in the premium tanks.