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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 can't tell from the pic but is the chamber got pits in it too?
If not I'd say to find a head shop that welds aluminum and have them weld it up.
Those type places are sort of common anymore but you may have to ask around to find out where they are.
I think I'd start at the local machine shop.