Peter,

Have you ever torqued heads in place with stretch type bolts such as these?

If not, you will hesitate when you start because you will think that you are going to break the bolt. Also, either mark their position after the torque wrench step with paint so that you don't lose track of which ones you have stretched to the next step, OR make sure that there are no interruptions that will make you lose your place in the sequence.

Also, get ready for a workout. Unless your last name is Schwarzenegar, you will be huffing and puffing when you're done.

Best of luck and keep us posted on progress.

Have a great day,