I have been running a small block injected dragster on alcohol and have started to run small amounts of nitro as well ! I run an MSD 7AL 3 box with a 2 amp coil ! I started at 13 percent and the car picked up about a tenth and now have gone to 25 percent with really no gain at all ! With an 84 jet the plugs show on the lean side yet going to an 80 jet shows no change at all ! I tried a little more timing from 34 to 36 and no change at all ! Could it be that my ignition is not putting out enough ? Thanks Bill !