i was looking for headers also, 71 runner with a 440. here are some that i found on summit, but i think im going to go tti just for the quality and the fitment. removed last pair of $100 headers with a sawzall

http://www.summitracing.com/parts/WLK-85...Size|7.2L%2f440

http://www.summitracing.com/parts/HED-78...Size|7.2L%2f440

http://www.summitracing.com/parts/BIG-13...odel|ROADRUNNER

http://www.summitracing.com/parts/SUM-G9...odel|ROADRUNNER

nice thing about summit, give you an idea of what you may have to modify with each header, like shift linkage, no p/s. etc...