65-66 ignition cylinder

WIthout the key, it will be much harder. Unless somone else has some amazing trick, I think you are stuck with drilling the cylinder. Needs to be able to turn to the ACC position, then depress the pin through the hole and turn farther counter-clockwise and pull out.
 
I asked a friend of mine about this. He has been a locksmith for a long time, and he thinks you will either have to drill it, or have a locksmith pick it for you. He thought he might be able to make a key by feel, but it would take a long time, and of course that will cost more.