I'm a bit surprised that the Gonk didn't show more of a variation in mileage. The numbers you give would convince me not to bother changing the rear. Too much work and complete loss of performance for the miniscule savings, not to mention starting of in 2nd gear probably. I thought about this last night and decided I'd really hate 3.0 gears, regardless of gas savings. I didn't build this for 3.0's.
I have mech adv dist. I'll have to look at my notes from Faron to see what my total adv is; it may be over 40. I only checked it once this summer and forget what the actual reading was. I'll lower the center carb jet size a few numbers and see how that works. I do know that the performance was very noticeable after having the dist blueprinted by him, and that no vac advance on the street is absolutely no problem at all; just like he promised.
