stock rev limiter removal

Definitely a new chip, new ignition box or similar device. FMS has one, but it probably costs more than a MSD or Crane ignition box.

Unless you plan some serious mods like heads, cam, intake, etc, don't consider it . The stock engine runs out of power above 5200-5400 RPM
 
An ignition box won't remove your rev limiter. At least the 6al that I have didn't. You would have to install an aftermarket chip if you wanted to do it yourself. Otherwise I believe you would have to go somewhere where they know what they're doing to modify the stock brain.