GT.........I just ran into this very same problem on my '68 Road Runner (with the 8-3/4"). The studs are 0.50" diameter at the thread but then step out to 0.615 shoulder right before it goes into the flange. I took a 5/8" drill bit and adjusted the depth on the drill press so that it wouldn't go all the way through the rotor. This essentially put a 45deg chamfer on the hole and let it bolt up flush.
I also had to take a die-grinder to the center hole on the rotor as it wouldn't clear a minor step in the center cap. I had to take off approx 0.10" on the rotor in order to get it to bolt up flush.
I spoke with both Frank and Dustin (Wilwood) yesterday and was told that was the easiest solution.
FYI.........I have the same rear brake setup you're installing and am also going to run Forgelines.
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