Keith Lamb said: Andy Jorgensen said: Drill them, then use an easy out. Once they are out, replace with stainless steel set screws or a regular bolt. I've also drilled them out, making the hole bigger, then tapped it for a larger bolt.
Great minds think alike. But Andy forgot the anti-seize.....one of his few flaws. 
That's only because I don't like using anti-seize. Huffing it leaves too much of a mess under my nose. Everyone wonders why I have silver or gold "paint" on me. Only time I do ever use anti-seize is when I coat my mechanics phone ear piece. Always a good laugh when he walks around with it on his ears.
And sorry, my mistake. Use the dang anti-seize on your bolts.