Re: c20 to c10
The self adjusting brakes didn't come out until '66.
It has been a long time since I have done anything to a '63 12 bolt, so it is possible that the original wheel cylinders and shoes are different than what is used on a '64+. But I wouldn't be surprised if all the the '64+ brake parts will work just fine on the '63 12 bolt. Just go down to your local auto parts store and pickup a wheel cylinder and see if it works.....they are fairly cheap. If it won't work take it back.
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