whats the condition of your axle? havign a bent shaft or housing can also cause the bad tracking.....

is it your front or rear springs that are having the issue? if its the front, do you have the 3/8" spacer that most aftermarket manufactures use on the left side to compensate for making only 1 front springs instead of a left and right?

On my 85 my rear axle wasn't aligned properly and my dad mechanic simple loosened up the u-bolts and "kicked" it in to position and then retightened the u-bolts.  It sounds like your issue is more substantial, but it's an idea.  You could also have bent frame.  Has the truck been in an accident that you know of?

I ran Superlift springs on my 85 truck and it didn't have a 3/8 spacer that jimbo74 is talking about.  I believe the standard aftermarket springs like Superlift, Rancho, Pro Comp, etc. have different arches for the front springs while the off road companies like Marlin, All Pro, etc. use the same springs plus the spacer.  You could have your front springs backwards or something could be bent (guessing from your other issues).