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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.
my question is are you sure its your lifters? but anyway there is only one way to replace them. pull your upper and lower intake off and your valve covers. loosen your rockers and pull the push rods out make sure you put the push rods back in the same places dont mix them up. then with a pick you can pull you lifters right out
If it is a roller lifter it'll be tight but I just test fit a stock head on a block I have on a stand and you can pull them out with a pick after doing what hackgt350 said ..it's tight but they should come out if that's your problem