I highly recommend Dougs headers Tri-ys (not Doug Thorley). They are very well made, fit well, do not hang down low, and make power up to 6500 - 7000 which is quite high for a tri-y. I've got them and Roadracer (on vintage-mustang.com) has them and they make power up to 6500 on my 331 and 7000 on roadracer's 289. Non ceramic coated is about $450 and ceramic coated is another $100 but you'll never have to replace them. No PS extension bracket is required.