raptureboy, this may sound crazy but you could use two bellcranks if you had too. But how about using nyrod. It is flexable and what you should be using on a gas motor anyway. Anotherway would be to make a bellcrank out of a long double sided servo arm. Attach the arm to a motormount, engine a bracket what ever in the center with one side going to the carb and then the other to the throttle servo. Depending on how long the arm is will determine how far up the nyrod is put but very easily move it up 2". You can make one out many things even some good 1/8" ply that you coat with thin CA.

Randy