Thanks folks. I'm replacing most of the components because they are just flat wore out, plus I like taking stuff apart. I'm replacing with a mixture or Dura Ace and Ultegra NOS. Ebay is great for this stuff. I'll be keeping the 105 cranks and brakes and I'll use the 105 hubs for spare wheels.
Thanks for the info on the Dura Ace cogs. I wasn't aware of this.
Sheldon has a lot of great info. Thanks for the link.
Tracy