I realize that there are several significant differences between '67 and '69 (elecrical vs. vacuum for example), but to give you an idea, for '69 it would have involved:
different outer fenders, different inner fenders, different grille, hideaway headlight assemblies, vacuum actuators, protection covers for the actuators, mounting brackets for the vacuum actuators, vacuum reservoir, relay valve and the associated vacuum lines, different headlight switch with vacuum hose connections, check valve, etc.
If you have or have access to a '67 assembly manual, look in the back at RPO Z22 which details the RS package.