DIYHEMI has some good videos on youtube, here is one for your kickdown cable question.. https://www.youtube.com/watch?v=5H6Jt6G5DcA&t=474s

I believe they are using the 03-04? RAM TPS box (so you can use your old cable driven gas pedal) and hook up the kick down to that connection. I watched the video a while ago and forget all the details.