Will take a different linkage. The carb link moves in a circle, so how well it 'pulls' the cable changes based on where it's connected. At 3 o'clock, the initial rotation will move the cable very little because that point on the linkage is mostly moving down toward the ground. If it was connected at 6 o'clock, then it pulls early but at the end of travel it's mostly moving up/down rather than fore/aft, so they're probably right. Having it connected at 4 o'clock will ensure you get the cable to move close to 1:1 with the throttle.
How long the lever is on the carb will change how quickly the cable gets pulled also...
