Header suggestions???

I have a 1974 duster with what appears to be a 1967 valiant 273 k-frame, a 1974 360 out of a motor home and power steering. There appears to be NO room between the existing 318 manifolds that are on it and the steering gear box (which is a '74, I replaced it after the original broke).
Any idea what headers might fit? I'm a little skeptical about fit.