Dougs headers or TTI step headers?
My TTIs did not fit at first. After I spent a week working on it every night getting the engine in the right location, egging out the k-frame slot on one side to slide it back some and shimming, they fit in with no dents needed. Mine are close to driver's side frame rail but I run Shumaker Torque Strap and they never hit not even once.
Sounds like they were the wrong headers. Glad to hear TTI is taking care of it.