Steering wander and Chinese parts?

Sounds like you have some f**kery from the prior owner. The idler arm bolt should be shanked as shown in the pic, and yeah standard would be normal, but at the end of the day if the bolt/nut tighten it will do the same job.

Here’s a good thread and post 3 has the Skoch chart with updated alignment specs which will help with the wonder. And a link to the FSM (manual) that will have the torque specs for most everything.

1973 Dart Suspension rebuild