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Click on image for the lowdown. 
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All sorts of answers from a web search:
473483 is a 1975-1976 250
or 1973-1979
or 1966-1979
or 1979-1985 (integral manifold/head, supposedly)
Is the intake manifold integral with head?
Maybe someone will know of the meaning of B271 at that location on the block.
I'd guess (a wild guess) that it is a date casting code:
B = February
27 = 27th
1 = 1971 or 1981
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