As for headers, TTI or Dougs generally fit the best.
Wonder why the Doug's longtubes only go up to '72 for Darts per their site, mine's a '73? Do the TTIs or DOugs tuck up into the subframe rails better? I'm thinking about ditching longtubes because all of the (admittedly cheaper) ones I've seen on low a-bodies and b-bodies hang low enough below the subframe to where they scrape pavement pretty easily
