I might consider a MSD 6 Box. What wiring is involved? and can it just be unplugged if the box fails to make the existing points operational? Also is the condenser still used with the MSD box? With a stock dist and and points with the Acell Super Coil and a manual choke on a stock Carter 1 bbl with a free flow air cleaner the car starts the first time in about 3-4 seconds every time in winter at temps around zero without that heater box with warm air to the carb off the exhaust manifold. In summer it fires immediately. You can tell I am an old timer as I never learned the Metric tire sizes. I have the equivalent of E-60-14's on the back and a slightly narrower and shorter tire on the front for sway bar/tire clearance. The speedo is pretty accurate and I get between 17-20 mpg around town. I do very little highway driving so I never checked the mileage. If the MSD box would give an improvement I would know no matter how small as I am one of the old timers that feels everything that most kids don't in there cars, especially since I have driven my yellow car for almost 32 years and the orange one is the same car. I know ever squeak, rattle and noise in this particular year car. "Doc"