From the results I could find, looks like NSU 1000 and TTS (no displacement listed - could be the same car, or a 1200TTS or a 1300TTS) raced in the Trans Am from 1967 to 1970. Seing as the 1000, 1200 and 1300 in base, TT and TTS versions all used the same body and that the Revell model looks like that body (based on a 1300TT I believe), I'd say you're good to go (better get official verification tho' from nhdungeonracer).
Revell model: http://palauhobby.net/IMAGES_32/Reve...%C3%BCrgen.JPG
NSU at '67 Bryar Trans AM: http://i586.photobucket.com/albums/s...rans-Am069.jpg
And welcome to the world of short, skinny, overheight, underpowered thrill seekers