Thanks for the info. As you can see I'm still getting mixed results. Sounds as if it works for Justin without the spacer, although I'm not sure if there's any slight differences in clearence between a 67 SS and 66 SS. I also did one of the searches on this subject and read many conflicting reports. I would like to find one guy with a 66 that has it installed and knows it will work. Again thanks for the help,this is one great site and one great group of guys.