This is crazy, You have TTI headers on a 6.1 and a stock Mopar starter that TTI sent you that fits fine, why dont TTI tell me that this stock starter will work????
I emailed TTI again yesterday, i was hoping maybe they have more options now for starters, but they are still telling me - "The 9523 is the only starter that will bolt on your application without any modification. The Powermaster #9543 is the starter that we had problems with. I believe that it was discontinued."
Maybe you should email Sam at TTI and explain your setup to him.