I'd personally never buy a anything from TTi it's way to expensive. The dart I had came with a set of TTi "step headers" and complete 3" exhaust. It fit nice but I have a freind w/ a BB dart w/ the Summit 3" kit and it fits nice too. My swingr had the nickel plated headers but after a few years they started getting a little rusty. I have used Summit brand or, Heddmans on big and small block cars. Mostly b-bodys and have never had a clearance issue or had to "ding" them. I strip them and paint them w/ high temp paint and put them on. The set I had on my 67 coronet looked nice after 3 years. The trick to any header is to take your time. Get the motor up and steering out of the way and they should go on nice. Especially on a small block. Performance wise you not going to lose much if anything. Good luck.