I am not sure..... but with HG/Bolts being a known weak point, if I were going to do it, I would take the time to remove the heads, replace with KNOWN GOOD NEW HEADS GASKETS and Verified GOOD heads by a machine shop.
There are also clearance issues on the rear cylinders to remove the bolts against the firewall/cowl to get the bolts out and the studs in. Also, proper ARP Head Stud installation procedure has 5 separate torque/loosen/torque sequences, which would suck hanging over the fender/radiator. I just had to remove the FICM and just leaning back there long enough to do that, sucked...... let alone enough to do heads.
I/when I have to do head gaskets, a buddy and I will remove the engine (Removing the "cab" on an Excursion would be difficult at home). We will replace the head gaskets and install studs at the time, and probably do an EGR Delete at the same time and reinstall the engine. Much easier to work on when I can stand next to it, especially during the stud install sequence.