master cyl question

My '66 has a master cyl. from a 74 Maverick. It stops as nice as power brakes. I am running '70 Mustang front discs and stock rear drums. Not sure of the difference this would be for your '67.

74 Maverick manual disc or 88 Ranger manual disc. There are others that will function well, but have the lines exiting the master cylinder on the engine side as opposed to the fender side. Which ever you choose, make sure the brand you buy has the pedal rod "NOT" installed, as it is likely the wrong length for your needs and is almost impossible to remove without destroying the master. Your existing rod will likely be the correct length and who cares if you mangle the piston on a core? Oh and I suggest you bite the bullet and buy new. The last three times I bought a rebuilt for projects, I had problems (crappy, leaking covers/seals, improper function, etc.) and after returning a couple times for warranty, ended up buying new anyway and was out all the extra labor.
Just My $.02 & Good Luck,
Gene