67 Barracuda Big Block K frame keep it or change it ??

My 383 Formula S has factory power brakes. I have been doing factory 383 A-Body's for 45 years and too many times I have seen one modification lead to the flame hammer coming out after a while...

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Lucky you. Mine has factory disc, but I'm just interested in adding a booster, how and what is the issue I have. Can I just add a booster, where can I source parts needed? Thanks!