*mikaztro - Official specs (
Kei Car blog) are 3400 mm (L) x 1475mm (w) x 2000 mm (H) and an engine displacement of no more than 660cc. So
your LJ80's length and engine size disqualify it from being a kei car, strictly speaking.
However, note that Japanese kei car manufacturers often provide bigger engines for models that are exported or manufactured abroad (Maruti Alto, which is being sold here as the Suzuki Alto) and at times even expand the body beyond kei car specs (such as the Suzuki Wagon R Wide).
For me, if you are not in Japan (and therefore, won't benefit from the advantages of owning a kei car) the specifications are not as important (unless you are an aficionado with a purist belief). What is more important is that you enjoy your ride.
