Put a note to remind you on the steering wheel. I forgot once that I had backed off my rocker arms and bent half my push rods, now I put a reminder note on the steering wheel when ever I do stuff like that.
Here ya go
http://www.summitracing.com/search/Department/Exhaust/Section/Headers/Part-Type/Headers/Header-Style/Full-length/Make/DODGE/Model/DART/Year/1973/Primary-Tube-Diameter-in/1-7-8-in/?Ns=Rank|Asc