The engine number you gave, 5467125 5 translates to a 1949 Super. I don't know when the inserts started, but seem to remember only a few thousand , maybe 5000, did not have inserts. Yours comes way into the years run, maybe half way.
The 1's are I's in Buick numbers. As well as 6's and 9's are lower case b.
Ben
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