Broken manifold studs on my 4.7 PITA!!!!!
I just fixed the "ticking" on mine, here is what i did. I bought headers, figured if I was gonna take an exhaust manifold off i wasn't going to put it back on. Drivers side I took the master cylinder and brake booster off for access. Alot of the heads on the manifold bolts had rusted and were different sizes, I used a 10 mm on some, 9 mm, 5/16" Grip-rite socket.
My tick ended up being a blown out gasket on #8.
As soon as the stud is broken loose, they would back right out with fingers. There were two that I could not get off, and had to cut the heads off with a grinder, and once the head was off the rest would thread right out. So i bet that you won't have a difficult time getting the rest of the fastener out of the head.
Good luck and keep your patience.
Steve