62 Chevy II Nova 400
If I remember correctly the Nova 400 trim level was only available on 4dr, SW, 2dr Hdtp and the Conv. The Chevy II 300 level was only available on 4dr, 2dr sedan and SW. Therefore, all 2dr Hdtp and Conv. cars were Nova 400's.
In addition to a higher level of trim, the Nova 400 also added options such as a dome light switch located in both front doors. The two speed windshield wiper w/washer. Maybe dual horns (not sure about that one). Rear armrest w/ashtrays (?). Backup lights (?). Glove box light (?). Courtesy lights (?). Cigarette lighter (?). I don't believe any of these items were included on the Chevy II 100 series cars but I'm not sure which ones may have been on the Chevy II 300 series.