You have no mechanical adv until 2200 rpm? just off of idle as the rpms climb you would need the spark to start advancing & I had an eng I was playing with & I used one of those I believe lean burn dizzys w no adv & it got way hot fast from the retarded timing in the driveway just from goosing the throttle. I had a ph conversation w Don @ FBO & it went real well and I even get along w Dave Hughes