Newbie with a tranny question??

[ABX131]

my 63' truck has a 350 with a th350 with a Transgo shift kit. I don't like it. I don't like how you have to drive it like a manual. What is the purpose or advantage of this? Is it external or internal? If it is external I want to convert it back otherwise I will have to swap the tranny....Also I want to switch it back to a column shift, it is currently on the floor. I heard that a column from a 68-72 will bolt right in, is that correct? I may have a line on a free one..I have access to a full machine shop if some mods are necessary..