Here's a picture from the CJ forum of the crimper jaws for open the open barrel terminals.
http://www.jeepforum.com/forum/f8/basic-wiring-101-getting-you-started-1340134/

Some of his links are dead but the pictures are useful.
Some On-line/mail order sources for Packard or Delphi 56 terminals and connectors:
Terminal Supply Co
Waytek Wire
The Electrical Depot