As the subject says I have a 250 chevy inline six in my 72, 40. I need advice on the carb. It has a Monojet on it and its not running right. It backfires at like 1/4 throttle. I know I can adjust the fuel air mixture and lean it out a little. My question, has anybody ever run one of these off road. I know the Quadrajet runs crazy angles compared to other carbs. Is the monojet the same? Or should I get in touch with Clifford Performance and buy a manifold, carb (Webber 40idf) and some headers?