You want to remove the rear feed guide and front cartridge stop. The retaining pin holds the rear feed guide, belt holding pawl, and farward cartridge stop. You can remove them by pulling this pin to the rear. Sometimes as the tutorial says the rear feed guide will be welded in. Mine was not as with probably quite a few others.
The tutorial says nothing about the right rear cartridge stop. That is riveted in and should be ok to use with 30.06. You however will need the front right 30.06 stop installed.
right front 30.06 stop
right rear 7.62 stop
and the belt holding pawl
These are the minimum amount of modifications to the feedway area to run 30.06.
Will