First, I would start with contacting Lokar or Holley to see if they have adapters for your carb to mate with the cable. This is because you have already bought the cable.
Next I just used a longer piece to reach the linkage on the Holley. I actually used one from a /6 it's a little curved on the front end but works fine with my set-up. Can't swear it will work on your set up but I have read of several guys that just welded two together to get the length they needed. This also leads me to believe that all you need is a longer piece. Hope this helps.