Dual Master Cylinder brake lines?

Hi guys!
We are going to install disc brakes on the front of my dart in the near future. I want to upgrade to a dual reservoir master cylinder.
I am wondering what I should do for the brake lines?
The car has a single reservoir master cylinder now. So a little confused what I will do since I have only 1 brake line to the master cylinder.
I have read where people are putting master cylinders from 70-74 but not really sure what to pick.
Will the lines have to be made or can I just go to the part store to buy some?
Also I do know I need a proportioning valve from what I have read.
Please not guy I do have a 1966 model.
Thanks for all the help in advance!