Page 10 on those EZ-Wire instructions has all the info you should need for the entire steering column (turn signals, hazards, ect)
http://www.hammar.dyndns.org/wiring/1965/1965e.jpg
Ok, so I don't know if you have this diagram or not but it should really help you out. I'm going to see if I can help a little with the head light switch....
Lets see here, wire #14 in that diagram is black and should connect to the EZ-Wire harness labeled rh/lh park=brown. #11 should connect to the same to the same wires in the EZ-Wire harness that #14 does. It looks like Ford does it front/rear and the bow tie boys do it right/left. Pick one and connect each wire to 1.
#15 in the Ford diagram should still go to the headlight switch to control regular vs bright headlights.
Wires #10 and #460 connect to the same connector on the switch. #10 goes to the brake light switch. #460 goes to the horn. From what I can tell, thats the Green wire labeled horn on the harness.
The Tan and Light Green wires in the harness should be labeled for headlight low and high beams. These should hook into their respective plugs on the floor mounted switch that gets its power from the headlight switch.
#25 needs to be hooked up to a fused source. This should be the black and red wire labeled headlight bat.
I think that does it for the headlight switch. Let me know if I missed something.
The ignition switch in the diagram only has 2 wires going to it and both of them run into the fuse box. That digram isn't 100% complete. I don't know off the top of my head where the rest of the hookups on the ignition switch are suppose to plug in but I bet one of the diagrams here will have the info:
1965 Mustang Wiring and Vacuum Diagrams