Hi guys So I have been tracing down issues with my 1971 Valiant and going through the motions to get it where it's not a complete dog. It was super boggy and slow as a school bus, but I seem to have resolved all the issues and woke the car up. It would have helped if the timing hadn't been completely as far left as it could go btdc (yikes... but engine ok). Anyways my question is now that I have the engine running right I would like to change the jet in the holley 1920. Currently it has a number 55 which I believe is what came factory in 1971... correct me if I'm wrong. Looking at my spark plugs tells me it's running lean, with a coating of frosting on each plug. So what jet size should I jump up to? Most people seem to recommend the number 58 jet, but I want to verify. The car is used on the street only.