Broken Ex Manifold Studs

[DBF]

Good Day:

I'm doing a favor for a buddy of mine, that is replacing the ex manifold gaskets on his '87 5k avant. As well, I would very much like to keep the head on the car.  

I knew what I was getting myself into, as #1 cylinder was missing both studs (broken) and #2 bottom was missing/broken as well. After I got the manifold off today, I discovered #2 bottom had something peculiar sticking out from the broken piece in the head. I've seen it before, an easy out that was broken off! Man they are hard. Good thing I can sharpen bits. 

Anyway, do any of you have pointers in removing the broken studs? I've done it many times before on 'merican iron, and I suspect the method is the same. I'm just a little leery about the aluminum head. I have a good VSR DeWalt 6 amp corded drill, but what I lack are right (or is it left, whatever the opposite twist bits are) twist bits. I have used these many times before and you can get lucky and remove the broken piece while drilling the hole for an easy out. Any pointers/thoughts would be greatly appreciated. Thanks all,