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if you think about it. alignments just don't go out. if you need an alignment it's because something has bent, broken, wore out.
so if you don't have perfect parts, it's impossible to do a proper alignment. after all front end alignments call for toe-in settings within 1/32" you realize how small that is. It's smaller than the gap on your spark plugs. if you have any play in any part, you have replace these parts.
I would be suspect if you have any alignment shop do an alignment without finding even one suspect part especially if it's a vehicle that's all original.