In my dealings with 350s, with an auto trans, there is a linkage that runs up from just behind the bell housing to the carb. I forget the exact name for it, but i do know there is one there. There is 2 different styles of cable for that, depending on the year of the tranny, so be sure to get the right one. The one I worked on had a much smaller end for the trans side than the one that they sell at Napa. (The only parts store on this island.) Hope that helps, I am sure there are some SBC guys out there with the correct name for that cable. If you have a chiltons manual for that engine, you should be able to find it in there.