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Go with the modern hydra-boost setup that's currently in use on the new Stangs.
BTW, why you looking for a big booster? All you need is pressure multiplication. Size of the booster has some to do with it, but the right master cylinder will make much more of a difference, as would adjusting the pressure between the front and rear brakes properly.
I was just wondering how big of a booster i could put in a 65 while also using a cable clutch. about ready to convert over to front disc and maybe and a booster.