Ok would like to resurrect this post. To refresh, I am getting 6 mpg on 1973 Dart Sport 340 that has a Edelbrock 650 with some sort of performance cam in it (do not know what cam is in it). I finally got a digital timing light and was able to determine initial and total timing. Initial timing is 24 at 900 rpm. Total timing looks to be 42 at 2800 rpm. I plugged the vacuum advance line that runs to the distributor when I checked the timing but it doesn't seem like there is any vacuum on the hose (put my finger over it). Trying to figure out if the way the timing is set is responsible for the bad gas mileage. If anyone has any thoughts I would be interested. Thanks!
