My own personal records show the Y6 as in the one C4 hi-po carb I rebuilt (for the last 15 years I have kept records of all my rebuilts since I was comming across discrepancies)So sounds liek you are on track for the booster, Incidently the last digit supposedly is a station code (never been able to confirm that though) so they are really Y and B. And I have seen Y as a hi-po number. What do you have for jetting incidently?
Bill White
White Automotive
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HAVE A NICE DAY!!!!