You don't need to buy a thread chaser. Modify an original bolt you pull out to chase the threads by cutting a slot or two in it.
I would follow the regular tightening procedure.
They don't protrude into the water galleries.
You use the torque setting of the bolt manufacturer, so arp in this case.
The studs should only be finger tight, and preferably backed off so as to not bottom out. The nut applies the tension, the stud just goes in the hole and shouldn't turn when tightening the nut. If the stud was to be bottomed out hard it could / would deform the material around the base of the thread and cause issues with the bore.