are you certain that the EIN doesn't start with "40" rather than "4C"?
the EIN is just the VIN with the model / body information elided.
4 indicates the Buick division
'C' should be the last digit of the year of production
Y is the plant code and should be Wilmington, Delaware.
the rest of the EIN would match the last six digits of the VIN that the engine came from. which, since the 'SF' is the Big Body 455ci application and the six digits don't begin with a 9 ( Riv ), there's a good chance that it came out of a Le Sabre or Wildcat model.
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Vladimir Lenin
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H.H. Goddard, Human Efficiency (1920)
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