Can I eliminate the vacume advance on a duraspark distributor from in an 85 GT mustang simply by not hooking up the vacume line to the diaphram. After all when setting the timing this vacume line is removed and pluged. Is there really a need to run it. I have an old Ford motorsport duraspark type distributor also that is basically the same thing as the stock unit and it does not have any of the vacume advance componets. Its completely mechanical. Just wondering if I can run the stock unit as a mechanical.