Thanks again CIH!
Using the original head-will leave in tensioner.
With regards getting access to the headbolts-I can turn the cam once I have removed the sprocket - is that correct?
Will strap the chain to the sprocket with a few zip ties so nothing can move.
Thanks again
Steve
Tbh Steve you shouldn't need to tie wrap it if you are just lifting head off. It doesn't move, there is a plate right under it that it sits on.
Getting access to the head bolts, epsecially the back ones. I bought a smaller length tool to get into the small space. Can't remember the sizing now, but my new bolts were allen type, old were splines. So I had to buy a set of spline sockets to get them out and a Allen type to get new ones back on, and the smaller Allen one to get into the back ones

P.S. just in case you or anyone reading this is interested here is video of mine running right after I fixed an oil guard round the cam area. Used an old ikea plastic storage box. I still had downpipes off at this point so was noisy and was preparing to set the tappets, after I got downpipes on.
Runs good now so hopefully that gives some inspiration.
http://vid132.photobucket.com/albums/q11/Pichost28/Cars/Omega/Videos/senator-running-cam-cover-off_zps4fmgkxe8.mp4