I've looked at every possible reason as to why the 86-88 lxi is classified and not the 89. There is a difference from the 86-87 and the 88-89 but the the latter are the same car. I've checked every possible reason they have same motor (intake man., TB, crank,pistons etc) Is it just because someone only tried to class. the 86-88 or has the 89 been rejected for some reason. Any info. would be great since the car I have to run is a 89.