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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 think it is a stock Ford roller block. I have the same triple X's on my block which was purchased as a crate motor back in 2003. I am pretty sure it is made in the US. Try calling Ford Racing and see what they tell you.