The studs are not knurled......they are splined. The proper way to remove them is to 'buzz' them out with an air hammer. They will draw back in with the nuts on re-assembly. If you spin the bolts in the frame, you will strip out the frame splines and always have to hold the bolt head with a wrench when doing alignments. (a real hassle). I've done a bajillion A-arms in these cars over the past 4+ decades and never had to pull a steering column.
__________________
Jeff 
|