By the factory service manual procedure? Missing much information. What is the suspension? Are there wore out parts? What is your issue? Has it been done recently?
On a stock front end the castor is adjusted by turning the threaded lower outer bushing to shift the bottom of the upright forward or rearward. Camber is adjusted by rotating the eccentric upper outer bushing. If the front end height has been altered these adjustments may not be enough to get it to spec. Toe in is adjusted by changing tie rod length by adjusting tie rod sleeves.
It should be in the factory service manual. https://www.amazon.com/1949-1951-Ford-Repair-Manual-Reprint/dp/B00435MUFG
@Center of the Galaxie pretty much covered it. Caster is adjusted by the threaded bolt connecting the lower upright to the lower a-arm, or the threaded rod connecting the upper a-arm to the frame. The camber is adjusted by the eccentric bolt holding the upright to the upper a-arm. Special wrenches are required (I made my own). As suggested, a factory service manual is required. This only pertains to stock suspension. Things such as dropped uprights or coil springs (I have both) changes all this. You are not offering much info.
It sounds like you may have something in the front end that is worn and affecting your alignment. Or perhaps something isn't bolted securely and moving the steering alters the position everything was last in. It sounds like a thorough inspection is warranted.
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