http://www.peachparts.com/shopforum/showthread.php?t=128001&highlight=W124+manual
I could provide a copy of the W124 cd service manual that covers your car and engine, including the torque specs for replacing the head gasket.
Your chassis is a 124.030
Your engine is a 103.983
If you're worried about cable and hose routing for this job, I suggest adding a digital camera to your tool box. That's what I've done.