Which Spindle goes where?

I had the same pondering for my 65 Dart w/ 10" drums a few years ago. I had even made a drawing, but didn't note if that was looking from the inside or outside, plus a year had elapsed after painting, etc. A photo is worth 1000 crappy drawings, so I re-post one from the link in post #6.

I found that one hole is threaded when I stripped the threads beating that bolt out. I thought I remembered which bolt I had beat, but the only way the ball joint sat correctly was opposite my memory. I couldn't make out the PN's on the spindle forgings. The drum backing plates are matched to the L & R spindles, but the stamped numbers didn't follow the Mopar even/odd PN = left/right (or vice-versa) standard (assembled as below). Anyway, the orientation I finally decided upon matches the photo below, w/ ball joint steering arm dropping lower at aft.