MSD LS series ignition controller. Works great. I went to an EFI stand alone system so I no longer need it. If you are wanting to throw a carb on your LS this takes care of all the ignition needs. Comes with instructions and data cable to make your own timing curve. Comes with both the 24 tooth and 58 tooth harness extensions so will work with any year LS. Collecting dust. Cash. Can text nine eight 9 - five 2 9 - one two 0 five