Need suspension help!!!!

I can imagine a late model ball joint bolt hitting a earlier model sway bar tab. Those sort of conflicts are to be expected. If so, The bolt head is less than the nutted end giving a little more clearance. I've not heard of anyone maching away approx. half the bolt head thickness but again I can imagine it doable.
At the same time... If car is on stands,the suspension is hanging way down, upper bump stops not installed, etc.., conflict may not exist in normal operation stance.