I have been getting some conflicting information about the conversion so I need to hear from the experts. First I was told that you can't put multi leafs in a '67 because the axle perches are in the wrong spot. Then I was told you could but all you have to do is grind down the springs a little because they are a little wider than the monos, but the perches are in the right spot. Does the factory traction bar have to come out? I need a clue.