Toein/Toe out

72 Dart Swinger 2dr.
I switched from power steering to manual (header clearance). I have tried repeatedly to get the toe in/toe out close enough to drive to an alignment shop. I get it set and drive around the block - no tire howl. Park it. Next time out it's howling. Look at it and one tire is either in or out visibly.

Bad idler arm? Something else?

Thanks,

fastmopar