Did you get this resolved? I was having the same problem and fixed it by moving the attachment point closer to the shaft, as 318will run pointed out. I am using a Lokar adjustable throttle cable with the push-on attachment to a ball stud. I used the Holley assortment kit of ball studs (PN 20-2) to find a stud to attach to a hole closer to the shaft of the throttle linkage. That worked for me. I have a 4-speed so I don't have to deal with an automatic transmission kickdown.
