I have run a mag on the street. Mine did not have any form of mechanical or "automatic" advance mechanism. Set the time @ 28 degrees. They are tough on starters this way. I had to run one because the head I was using had no provision for a distributor. The advantages of running a mag don't really work in our favor on our slow turning 4 lungers. IMHO a good electronic ignition is much better then running a mag even in a race engine. .