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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.
The main difference between the lifters is not the diameter....it's their height. A roller ready block has higher lifter bosses. If you use the spider-dog bones kit, you will be "limited" to small base circle cams. If you use the link lifters (Comp or Crane Cams), you can install a "regular base" circle cam.