Doug's wont work with 727?

Hey yall,
I was just doing some header shopping the other day on summit, when i clicked on the footnotes around dougs headers it said that they dont work with 727s? I have a 1971 Dart Swinger with power steering and power brakes- i am currently running Headman Headers and they over heat that power steering gear box so i was hoping to buy a set that would give it proper amount of room without build a heat shield. also with headmans i cant ge to all of my spark plugs without taking them off. i have a 360/727 combo and wnat long tubes if possible but i built my motor for torque so shorties or block huggers would work as long as the installation is easy. any advice and picures will help! - Thanks Sam