mnahon and pawel66 - thanks for the advice. I am fortunate to have a locksmith here in Knoxville with a lot of expertise in old locks, so I took this to them. They were able to use a super thin file and remove the keeper, then the barrel but oddly, they couldn't get the key that fits the other door to fit this door lock. I removed the passenger side door lock and compared the two and they are not the same. This leads me to believe that perhaps this handle/lock has been replaced at some point. Then when I reassembled the drivers side lock/handle, it no longer worked. I guess I'll just live with it.
Thank you again,
Harry
BTW - I am about to post an issue with the ignition assembly that just appeared today. Please have a look at that as well. (When it rains, it pours!)