I've done the conversion for the Duff's shifter to an I6 set up. Not too bad. I fould I had to shorten and rework some of the bends to clear everything, though. I know some people like the 3 on the tree for nostalgia reasons, but I really found the floor shifter to be a good improvement. I would recommend the Duff's - it seems to be better made and has a shorter throw.