Had the same issue on my Dart when I had TTI's on it. I had to offset the bottom "arm" or dog leg out towards the end of the Z bar tube in order to get it to clear. I'm using Doug's headers now and it would have rubbed them also had I not already made the change. Sucks I know, but there isn't a lot of room in that area with headers or at least TTI's and Doug's. I didn't want to crimp my nice new headers so that's why I reworked the zbar. Way back in the day, I ran Hookers and there wasn't any issues with the zbar or the factory starter as far as clearance went. The headaches began after I redid the car and used something other than what I knew to work. Live and learn I guess.