dual master cylinder
#3
First, cars with four wheel drum brakes do not use a proportioning valve. Second, as noted, just use the 1967 parts. The dual circuit M/C requires a shorter pushrod from the booster to the M/C, so you can't simply bolt one to your current booster. Inline Tube sells the shorter pushrod, but you have to disassemble the booster to install it. The easiest thing is to just get a 1967-72 booster and a 67 M/C. For drum brakes, you'll need a distribution block, which is NOT a proportioning valve.
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