The carb is the "Street" Demon. I've had it since it was new.
Ever since I put this wideband guage in, the numbers have been erratic. My inexperience in these matters led me to believe that the rowdy cam was responsible for that. I have had the carb apart and found it to be clean inside. The gaskets are fresh. I've sprayed carb cleaner at every point of the carb with the engine running and cannot find a vacuum leak anywhere. The metering block has no removeable PVCRs. I am not sure about the Idle feed restrictors. I'm not even sure what they are. I'll have to do a google search on that.
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I just did a search. If what I saw was correct, the IFRs are a passage in the metering blocks. I gather that some are drilled during the machining process and left that way. Others are threaded so different size jets can be used for additional tuning. I am pretty sure that mine are only drilled.