B-body disc brakes

Outsider said

76-'78 B-body Calipers may work with '73 A-body disc setups if they are are on 10 7/8 rotors.

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'76 and later B-body calipers, caliper brackets, and 11.75" rotors will bolt right on to '73-'76 A-body spindles, making for a handy monster brake upgrade.