[sugarmaker]

64Steve,
Yes as mentioned by miker98038, the Ford Truck Enthusiest forum FTE is a good resource for getting information on your brake conversion. Also just basic truck info too.
Your doing the right thing on changing to the dual master cylinder. For peace of mind and safety if needed.
I replaced the single MC on our 65 Comet and went with front disc also. I used a company in NY called Leed. Everything worked well on that change over.
You can't use your old rod??

Regards,
Chris and Cheryl