I don't understand the 40% thingy,
Unless you mean the difference from 12 to 22 miles per gallon?
I like the way you backed out on the "NONE" comment, you know you love that electronic ignition.
Unless its a total rebuild you will pick up 3 to 4 more mpg. On a good day.
See you at Amelia buddy, come join the dinosaur 1 % its fun, till the end, and the end is soon.