The allen bolts Are your head bolts, they are 10mm so you will need a 10mm 3/8 drive and maybe two short extentions or one at least 6" to go with the torque wrench. The procedures for taking the head off can be found here.
http://groundsky.co.nz/techinfo/TSRM/03_EM.pdf
page EM-32.
I re-torqued my head bolts last week and had to hook my battery back up and crank the engine a couple of times because the cams were interfering with some of the bolts.
The 7M engines are supposed to be non interfering engines so turning one cam at a time shouldn't be a problem.