I'm not sure, and hope that others will chime in, but I think I remember talk of some of the Grand Prix brake parts being usable, also Monte Carlo etc... But the second Gen stuff as far as the calpers, rotors etc... I don't think will work?

Perhaps the booster, etc...

I know I have a booster and master cycl. from a vette on my 67, with a disc rear from a 79 T/A,
and 69 front disc set up...

Not much help, but maybe a step in the right direction?

Brett - 67 Drop Top 455!