Best possible mileage?

rumblefish360 said
Doesn’t start with a bump of the key?
More initial timing, limit the advance back to what you have now. More initial makes the car jump better off idle.

Setting the optimal cruise advance was one of the changes I made with the headers, carb, head, and thermostat. I'm wondering if the BBD is just operating leaner out of the box than the original Holley 1945. The plug on the left was before the mods and on the right is now...