I probably would not tend to try to mark it before disassembly and try to line of the same marks when re-assembling. That is because I had success with the above method. Here is another thread where I considered various ways of making this adjustment, and ended up using the back-it-off-by-1/2-inch method. The proper way requires torque wrenches I don't have.
http://67-72chevytrucks.com/vboard/s...d.php?t=812162