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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.
And drill it where? My tensioner has a boss around the pulley hole and the threads are left handed. At the other end on the mounting bracket there are 2 holes that the tensioner arm has to line up with. One for the pivot and the other for the spring to be held captive.
You might want to call March before you start drilling holes...