post the trim tag info, located on firewall on driver side, under Tag Team. does it have original drivetrain. post engine code, located on pad in front of passenger side head or possibly down by oil filter. For SS check for two fuel lines coming from tank. multileaf rear springs. 12-bolt rearend. for RS need hideaway headlights and head light washers. also back up lights will be mounted in lower valance panel.
68 Ash gold RS 327