So there is quiet a lot of information online on how to tune-up the Quadrajet by changing the primary and secondary nozzles and metering rods, as well modifying the sizes of certain passages. However, I have found none on what to do with the float level. As far as I know for instance all Buick 455 1970 had identical Quadrajets apart from the individual tunings and the part number corresponding to that. As basically every engine model has individual float level specs this must be a tuning parameter of some sort. So how to go about the float level when custom tuning a Quadrajet? If the carburetor is already tweaked, it sounds unreasonable that the float level should be left at the stock level. Trying to asses the overall air fuel ratio and adjust the float level only if it is lean or rich in general? Reasonably, a higher float level would result in a richer mixture overall and vice versa?