If you use the Buick Engines by the Numbers and go to the page which includes 1955 here:
https://www.teambuick.com/reference/...gine_53-58.php
Your number (read it V 5627525) falls after the 1954 line:
50 V-8 322 V273956-5
and before the 1955 line
50 V-8 322 V720080-5
This makes it a 322 manufactured in 1954. It would be quite appropriate for an early 1955 car.
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