Rebuild kits for the calipers are easily found on the net. Same for replacement wheel cylinders.
In 1967 Ford used dual reservoir master cylinder for all model lines. If you are looking to change the MC, get a 67 MC and get lines and an updated valve to make that work. The real estate in and around the master cylinder is not exactly wide open
As to kits, they are everywhere. Which is to say they are universal brake conversion kits for large Ford cars. Not sure if that is what you want. Those "kits" will set you back between $800 to $2000 depending on what you are buying.
And I always ask the question, if the car stopped well when new, what will I hope to gain on a stock ride?
A dual master cylinder adds some safety and complexity. Will not change the stopping ability.
And do not assume a poorly maintained system is the way the stock disc/drum system was designed. Old friction items, old springs and poor drum & disc surfaces will degrade the stock performance.
If you are going to change the engine HP/torque or greatly modify the vehicle, sure drop the Benjamins on rear disc.
I have never owned much less restored a non-American car so it will be difficult to make a comparison as to difficulty or complexity. With that said the 4 door Continental of the period is not a simple or easy vehicle to restore. Little to no electronics, much of everything is done mechanically. And compared to a modern car multiply maintenance by three or four times. If you have a convertible, well to the club of frustration. As an example, there are 20 to 30 relays to make the top operate. In today's world a bunch of relays do not sound like much. However, these relays are mechanical not electronic and have not been made in decades.
Save your money where you can, because you may be on an adventure of bank drain. It will be worth it because the resale value is rather nice. Slab sides have been getting a better return than most other investments.
Good luck my friend!
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