Nathan
I think you will find your numbers are on a Canadian built motor. Many of the Chevrolet casting charts found on line (not only Chevrolet but Chrysler and Ford) completely ignore the huge production that the Canadians have achieved over the years and only include USA production.
It took me several searches where your numbers did not match anything listed before finding at first a list on Hemmings then eventually a couple more confirming it is a Canadian 261.
As you are probably aware the US/Canadian company splits are smoke and mirrors BS designed to produce vehicles for the many British Commonwealth countries during a period when non-British goods suffered huge import tariffs.
If you Google a map of the old factories you will see that the US and Canadian factory workers can talk to each other across the river without raising their voices! There are hundreds of apocryphal stories about the Canadians and Americans having Made in USA or Made in Canada stamps to put on components, and indeed full vehicles, as they wandered back and forth across the border.
If someone has not written a book on the subject they should.
Lang
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