Just out of curiosity, did you have a two wheel alignment, or four wheel alignment? I had similar problems with my 78SC and it turned out the RR wheel was significantly toed out while the rest were largely within specs. I still have a bit of tendency to follow the grooves, but correcting the alignment made things much, much less "quirky."

This is called "tramming". Pretty common here in Chicago, usually only with larger front tire width, if there are major ruts in the road. You need to take it to some smooth pavement and try the braking again. You can easily see if the wheel bearing is good if you jack up the front wheel and get someone to hold the steering wheel steady. Now grab the outside of the tire and try to 'wobble' the wheel side-to-side. If you can feel play then the bearings are shot, otherwise they are fine.

The other thing that can influence this is bump-steer. If your car was lowered as many here have pointed out you need to get a couple of $10 spacers. As the car hits a bump the suspension travel causes a shortening of the tie rod and thus is felt on the steering wheel. This occurs because the suspension geometry has been changed by the lowering.

Tristan