I had issues with my SSBC disc brake conversion also. I "overlooked" the little asterisk on their website at the bottom of the page that said "must use 15 inch wheels". Hey guess what, 69 Darts never came with 15 inch wheels. So my complaint was and still is with these "conversion kits" is why not make a true conversion kit that fits the way the factory disc brakes did with the 14 inch wheels. On my setup, the calipers rubbed the inside radius of the wheel because the 11 in rotor places the caliper out just far enough to rub. So I had to polish off the lead ins and the exit sides of the calipers to take care of the rub. I called SSBC and they said our kits will only work with 15 inch wheels. No sense explaining to the guy about A bodies never having 15 in. wheels from the factory and his kits were supposed to be a bolt in ready to go kit. I told him that the factory disc brake setup used 14 inch wheels with no problems so why couldn't they have used the same size rotors so there wouldn't have been an issue. He basically said that's they way they build theirs and they haven't heard of any issues before me. BS! I made mine work but only after some serious grinding and polishing. For the money, I wasn't happy.