It was the neutral switch...
Thanks J.HIDALGO, but I think you missed in the parenthetic comment at the beginning of my post that it *was* the neutral safety switch I was under there to adjust. My problem is all fixed. I managed to rotate the switch so that it works now. I never did find a hole to line up with a drill bit put through the switch lever like you're "supposed" to adjust it, but just turning it back and forth and testing found the sweet spot. I was only changing the shift rod bushings on general principle (seemed silly to try to adjust the switch if the linkage was all sloppy).