Headers with a 4 speed question.
Here's the modified z-bar info you need for either the TTI's or the Doug's. It's from TTI's website
Here's the one I did myself using an original. Basically you take the arm for the clutch adjuster, cut it off the Z-bar, slide it down to the very end of the z bar and reverse it so that the clutch adjuster stud faces inside instead of out and weld the arm back on. It's a pretty simple operation if you have a welder.