Okay Process of elimination! (according to size of car)
Honda: Prelude or Accord. Neither look like that.
Suzuki: Nothing that big in that era.
Daihatsu: Also only small cars.
Isuzu: nothing as square as that.
Mistubishi: Lancer or Galant, both have lower roof's.
Mazda: Roadpacer- looks chunkier(from memory), 929/Luce... Maybe, Legato series... but i think roof is different =/
If it cant be a Nissan or a Toyota....
My final guess is a Mazda Luce Legato!