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Depending on how out of plumb are the walls. I would plumb it enough and shim everything for the jamb and fit the jamb to the floor only if the floor is way out of level. One a 3'-0" opening (assuming?) the floor shouldn't be that bad, 1/4" out? cut one jamb leg slightly shorter and scribe the door bottom for the eye like Milt suggested. Lever the head jamb and use molding to keep it from moving and don't jamb the head jamb up to the header becasue if header settles more (you know it will) it will push on the head jamb and bind up the door
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