in 1965, the Electra could have had either a 401 or 425.
http://www.teambuick.com/reference/y...ine_number.php
GM vins didn't code specific engines until 1972, so that isn't much help for your question:
4 8? 37 5 H I 62091
4 = Buick
8? = digit missing, '82' would be an Electra, '84' would be an Electra Custom
37 = 2dr hardtop coupe
5 = 1965
H = Flint, MI
I = should be a "1", not the letter i
62091 = sequential production number, should be six digits
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