Doug's Headers A453 in 70 Duster with 4 Speed my experience
I think it's time for someone to tool up to make some equal length 1/2 fender well small block headers for these cars. Two tubes exiting via the fender wells and two tubes exiting underneath look like a good option. Could even do either four into one collectors or a Tri-Y design without a whole lot of primary tube pattern changes between the two sets.