Yes GM "A" bodies are the same.
Check this site
http://www.p-s-t.com/gm/gmfdbkconv.html
Any factory "A" body disks from 68 to 72 is a straight swap. Nova spindals up to 74 will work.
I used 75 Nova brakes same as Camaro/Firebird but the control arms need to be off set and tie rod ends changed.
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66 chevelle brakes versus 66 buick skylark brakes
go to this thread