Trouble removing upper control arms, seized onto studs

[70StepsideC10]

I have done a lot of searching on the forum but haven't come across anyone else with the same issue. I will be replacing the upper control arm shafts and bushings, but am having a really hard time getting them off the truck. I was able to get the nuts off the studs no problem, but the shafts are seized on the studs after 50 years. I have tried PB Blaster, prying, heat, hammering, air chisel behind the shaft and not having much luck. I was able to work one set of shims out on the drivers side and used a tie rod puller to free the shaft on that one stud, but can't get the other shims out on the drivers side to do the same. I still have the passenger side to do as well!! This can't be that difficult. Has anyone else had this problem and is there an easier way to get the upper control arms off when they are seized onto the studs?