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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.
Damn. Someone sold you a Mustang with an engine that's not a 5.0 HO? I'd be pissed.
I guess the good news is that HO engines are fairly cheap to buy. Maybe even spend a few grand and drop in a nice crate engine. $3,700 = 400 HP / 400 TQ crate engine.