Spitfire makes headers for the early A-bodies, but they are kinda funky ( no real collector to speak of).
TTI also has headers for the early A-bodies that uses a long tube design with 3" collectors. They are really spendy, and the installation is sort of complicated ( you have to pull the steering column, torsion bars, and a few other things, and you have to modify the tranny mount ), but they offer good ground clearance, and you don`t have to cut up your fenderwells.
