It is a DIY install if you have the right tools. I have helped on two installs....not as bad as you would think...but it is bad if you get it one tooth off! There is an 11 running a 6.4 cam with a 300 dollar spring kit with no tuning just to show it is possible. No codes on the 6.4 cam.
I am going to do the same thing here in a month or so, and also swap to a ported 6.1 manifold. Then comes the nitrous plate