Another marker on those cars is the bumble bee on the rear side glass. All 70 340 Swingers had them. They all got chrome exhaust tips as well, while many 340 Dusters and Demons got standard (non-dressup) exhaust outlets. Rally dash was standard on all 1970 340 cars, too. Also standard on 1971 340 Dusters/Demons, while the rare (Canadian only) 1971 Swinger Specials got the standard dash.