The 73 to 77 A-body spindles are the same tall spindles used on the B-body cars. The 73 Malibu spindles use 11 inch rotors. These can be adapted to the earlier A-bodies but require a turned down lower ball joint and the tie rod ends and ball joints from the later cars. There is lots of information on this website about tall spindle conversions.
66 El Camino 396/325HP 4-Spd
My Build Thread:
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62 Corvette 327/360HP (original RF engine and Fuel Injection) (future restoration project)
66 Corvair My son's project. Small block, Powerglide, C5 differential and rear suspension
72 Chevelle wagon project