I have been watching all your posts, also. Most of my trucks end up getting fixed and sold to support my hobby, my kids are all grown up. When I find a nice 2500 or 3500, then Id like to try the modified 6.4 in it. I am surprised the the 5.\7 PCM works, I always figured they would have pulled timing out of the bigger motor, as well as compression. Kind of like what they used to do on the 3 series truck motors from the 60's and 70's. As someone else mentioned, your an out of the box thinker and doer. Always need more of them. Jim.