Yeah it's the B210 here, Sunny in Japan. In fact, my desktop wallpaper is a purple B210 Excellent.
Rear end looks abnormally good for a 70's car but you'll need to redesign the front end if you hope for aerodynamics. This air dam would be a good start:
Vortexes off the sides may be a problem, though. Hard to know for sure though.
There's a guy on here that ecomodded a B210... screenname is blownb310. (In the US, the B310 generation was confusingly named "210". They did this with Bluebirds too...)