I use an Ice Ignition system with the volt booster. It is an inductive system and the booster keeps 16volts at the coil. It is a 7amp box with a two step and 10* start retard. I have a short curve in it, 30* at 1400rpm idle and all in at 36*@2500rpm. Works really nice like that. If i lock it out i sometimes get a kick back when hot and the timing retards with rpm about 3 or 4*, Its the nature of the beast when using only a distributor. Check yours, i bet it does the same at about 2500-4000rpm. Put a crank trigger on it and timing will be rock steady at any rpm and the timing has to be locked with this system. Hope this helps