The torque spec for 55-64 Chevy front bearings is 33#. This done while rotating the wheel.Then a fairly complex illustrated view of how to select the proper slot depending on where the slot appears in relation to the hole in the spindle.
Here is early Ford shop manual "When reassembling or adjusting, the adjusting nut should be run up tight (don't use a wrench-the handle of which is more than 12" long), and then turned back approximately 1/4 turn and the cotter pin replaced."
1957 Motors repair manual repeats the above under Mercury with addition of "while rotating wheel back and forth until there is noticeable drag or bind. This assures the bearing cones are properly seated. Then back off the spindle nut to line up to the nearest cotter pin hole which will allow the hub to rotate freely with no perceptible end play."
1957 Motor manual listing for Dodge and other Chrysler products. "To adjust the front bearingd, turn the bearing nut up tight. Then back it off one slot and the additional amount necessary to line up the slot with the hole in the spindle."