There were probably choices for the cubic inch displacment for that car. You probably can't tell by just looking at it and back then (if I'm correct) the vin # won't help you. There should be a marking on the engine and I hope someone will jump in here as I really don't know where you should look.
Unless you know the total history it may NOT be the engine that came new with the car. I don't have books that go back quite that far but could hook you up with someone who restores cars and could say in a second.
If all fails go to Hemmings Motor News.com in Bennington, VT. Good luck, T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/