Head removal sanity check (M110)

[rbtoj]

So I very likely have loose valve guides and will need to take the head of my 280slc to a machine shop. Before I do so, I just want to make sure I understood a few things that are not very clear on the service manual:
-The timing chain does not need to be opened to remove the head, right?;
-The head does not use stretch bolts (so they can be reused?);
-The manual mentions a special tool (116589010100) to hold the camshafts. Are there any alternatives to this tool?

By the way: are there any While I'm In There™ type jobs that could be done since I'll be taking the head off?

Thanks.