Hello sourdough:
I got a good laugh when you said that you had a 300 ford 6cyl. with starter issues, I have a 1978 4x4, 6cyl. and I too have replaced many starters on it. It's a deer buggy and fun to drive in the woods, but the starter problem hits at the wrong time, ALWAYS!!!! I've had it since 93, and rebuilt almost the whole truck.
After 2 starters I got a lifetime warranty for a extra 10.00 bucks and Advance Auto has lost money on me. I have heard that the reason for this is that the 6 cyl. stops in the same place on the starter ring every time the engine is shut down, I don't know. Have you ever heard of this?
Enjoyed the post,
safety first
HM