Steering box swap With TTI headers

I have a 66 Dart Small Block that I need to pull the manual steering box off and replace it with a Power steering box. Yes I m getting to old to fight that manual steering.
I was wondering if anyone had pulled a box off that had TTI headers. It looks like a very tight fit and I really dont want to remove the header. In looking at this I may be able to drop the K-frame enough to allow access but im not sure. I do have a 2 post lift or a drive on lift to work off of.
Let me hear your stories and the easiest way you found to do this change over. Its going to be a winter project so I am just getting as much information in order to prepare.
I also know I have to change out the steering shaft and coupling as well.
Thanks
Rod