91 Park Ave front ball joints

I have been working at this for hours, and can't seem to get anywhere. I ground off the rivets from the top side and have been trying to punch them through, but they aren't budging. Anyone know a trick to this?

Not only did I have to grind mine off, I had to drill out the center and then punch them out...

i usually have to grind them off and then use an air hammer with a punch bit to knock them out