Are you thinking about adding a small hole to the throttle lever on the carb? That could work if it's in a good spot to give the spring some leverage. If you're thinking about moving the trans kick down further down, you'd be adding more to the throttle lever... same concept with the little eyelet idea for the return spring... If i'm understanding you correctly. This is why I like pictures
Hard to explain in words.
If you're talking about the throttle cable bracket in the picture I posted, I'm wondering if you're seeing it correctly. The oblong hole at the top of the pic is to mount the bracket to the carb. The 3 holes in-line with each other are for the throttle cable (largest hole) a bolt hole for another trans kick-down bracket (middle hole-kick down bracket not shown) and the return spring hole (bottom hole).
EDIT: oh, and this bracket is for the lokar style throttle cable. Not sure how you'd mount a factory throttle cable to this.