Best Headers For My New 74 Dart Sport

I am currently running the Heddman 78500 "block huggers" and not real happy with them. The collector location makes real hard bends necessary to keep exhaust above crossmember and steering linkage, and the ports don't match the heads on 340-360. They are port sized for the 273-318. However, I just bought a set of Doug's D453, and they are port matched to the 273-318 also! When I contacted Doug's (pertronix) about it, he basically blew me off, and said also, if I modify them to fit, there will be no warranty. Bummer!!!! I say buy the TTI's!