I have never ran a 1/4 mile dirt track and have no clue on were to start with gearing. I was looking at 15 or 16 driver 67 68 rear. Champ kart 455 weight. I would do a trial and error process but we get 1 practice and not enough time to change gears in between most likely. Then we qualify and wait for feature. 35 raceway in Frankfort Ohio is the track. Thanks in advance.