I would have Bill at power hungry performance tune a 6 pos switch. He realy knows what hes doin with those engines. He tuned my 7.3 for me a couple years ago, i had bigger injectors, big oil and a turbo and all that on a PMR 2002 motor and he tuned it good and i never had any problems out of it whatsoever and it ran like a raped ape.... He just kept the total timing down to keep the rods happy...