I had to replace my dist. with a rebuilt one from autozone. My car has the dual diaphragm distributor(2 vac. hoses). I got another dual diaphragm, and now I wish I had gotten one with a single diaphragm dist. Since I don't have the emissions stuff hooked up I think that it doesn't work as well as one with a single diaphragm. The dual one has one line for advancing the timing, and the other line to retard the timing. I have the advance hooked to the intake, and the retard to the carb...and I don't know if this works so great. See what others suggest, but I think I want to convert to a duraspark electronic ign. and get rid of this dist. and points...I don't know if this helped any but ....good luck,Todd.