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I have not done it, but the "rumor" I've heard here and elsewhere is that it can be done by removing one bolt at a time and replacing with a head stud. Don't know about torqing either, but ARP should be able to tell you if nobody else knows. Also I believe the back bolts hit the firewall and the engine has to be tilted from side to side. I know one of the guys here did it and hopefully will see this and give you the scoop.
for the rear most ones you have to undo the motor mounts on the side youre working on and jack up the engine. It will tilt and they will clear. Just remember to tighten down the mounts again afterwards and repeat for the other side. Be ready it is a work out. When I did my ARP's I torqued to the first two stages when I put the stud in, then moved on to the next. ARP's come with a detailed instruction sheet with both the sequence and torque numbers. Once all the studs are in and torqued to the first two stages, use the sequence and torque specs for the third stage and torque them down...be ready for the work out!