Metric system, Engines:
1975-1980: 6 cylinder in line    3802 ccm    100 HP at 3600 r/min   speed 148 km/h
                    weight 1360 kg    length 4.34m    width 1.96m    high 1.34m

1975-1976: 6 cylinder in line    4235 ccm    110 HP at 3500 r/min   speed 160 km/h
                    weight 1440 kg    length 4.34m    width 1.96m    high 1.34m

1976-1980: 6 cylinder in line    4235 ccm    120 HP at 3200 t/min   speed 165 km/h
                    weight 1450 kg    length 4.34m    width 1.96m    high 1.34m
                         introduction of a double-barrel carburetor

1978-1980: V8 cylinder in line    4981 ccm    125 HP at 3200 t/min   speed 170 km/h
                    weight 1450 kg    length 4.34m    width 1.96m    high 1.34m

For the Station wagon, only the dimension change:
                    weight  1540 kg    length 4.43m    width 1.96m    high 1.34m

For Mexico was also avaible a:

                      6 cylinder in line    4629 ccm    174 HP 
                    weight 1450 kg    length 4.34m    width 1.96m    high 1.34m