Very interesting. From what I recall, the metal end (carb side) labelled as "S" in that diagram would hit the carb side of the outer cable (right side of what is marked "H") at about 85% of throttle opening of the center carb. I'm pretty sure the throttle cable on my '70 383 was original....but not positive. I'm also pretty sure that the A-12 throttle cable is the same as a '70 six pack. I'm curious why I see TWO six pack throttle cable numbers in Big E's chart.... is one (3418840) the '70 (round hole) and the other one (3418846) the '71 (square hole)? I would tend to think so since the 3418846 number lists "440 3x2 & 340 3x2" and since they only put the 340 3x2 in E-bodies.