Headers for my 71 Demon 340.

Doug’s D453’s are what I run on the 340 in my Duster. Great headers!

The only other ones worth running would be TTI’s. They sell both long tube and shorties, although having installed a set of the TTI shorties I’d probably just go with the long tubes. The shorties are a little easier to install, but they cost about the same and for the trouble you might as well go all the way.