1974 brake booster into a 1968?

I recently bought a 1974 Dart Sport so I could add the v-8 frontend and discs to my 1968 dart. Though my dart was manual drum, wondering if I can conver it to power disc with the parts from the Sport. Will the disc prop valve work, can it be modified to fit? Does a 1968 brake booster look diffrent enough than the 1974 version incase I wanted a factory look? Any mods needed to make that booster fit?

any info would be nice.