I started out trying to accomplish this mod with a spare linkage assembly I had laying around, but it didn't work out. The assembly was for a 240z, so was too long to fit on my 260z arm. Also, I think I moved the arm too much from the stock location, it just didn't seem to work right at that extreme of an angle.
So, while I had it apart noticed that the pedal wasn't using full travel to begin with, so I dremeled the end off one arm to make it shorter and now have full travel. On top of that I cleaned and lubed up all the ball joints (which were VERY sticky).
It's not perfect, there's still a little jerk at the onset of throttle, but it's MUCH better. It's actually drivable without focusing all my energy into the pedal. I think it'll be alot more enjoyable to drive now.