I have a 55 dry shot on my H22A. I have an adjustable fuel regulator and a V-afc. I got on the dyno and was running way rich. I adjusted the fuel curve with the V-afc and now everything is perfect. I am using Zex plugs and i didnt retard the ignition becuase im only running the 55 shot. I have thought about bumping up to a larger shot but havent done it yet. i have a stock fuel pump and injectors. hope this helps.