Timing chain sprocket Vs. Cam alignment?

[Neubie]

Hello again,
After months of denying that my timing/idle problems could be related to the sprocket/cam alignment, I was forced to admit it. The alignment marks are off 5 degrees or so after head gasket replacement.

I've got the sprocket off, the mark on the thrust washer lines up with the woodruff key that the sprocket slides onto, but that doesnt line up with the mark on the cam tower. How do I rotate the cam to align these. Im assuming then that I take the sprocket out of the chain and rotate it to the appropriate place before re-assembly?

Photo hopefully attached for reference.

1969 230 straight 6 (m180 i think?)

Thanks! hopefully this will get me back on the road soon!

Marc

http://picasaweb.google.com/philthytrucker/Mercedes