I used dougs on my 70duster 318. Had some small figment adjustments I had to make as the torsions bars were touching or super close to touching on both sides< but other people said it fit no problem with no mods. Other than bending the clutch z bar it was fairly straight forward and went well. With TTI and dougs headers you need to modify your z bar. Don’t know about Sanderson. You can heat and make a couple bends with a vice and hammer it should look something like this when completed.
View attachment 1715503710
