Hi topper,
Welcome to the Chevrolet forum. My apologies for the first response to your question.
The 1919 Touring is a "490" by definition. The engine number is stamped in the edge of the flywheel. The serial number is on the nameplate on the dash. I hope that at least one of the numbers match the number on your title.
The first Chevrolet was in 1912.
You did not indicate the number of cylinders your 1919 had. Could it be 8?

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Chevradioman http://www.vccacolumbiariverregion.org/If I had known that growing old would be this much fun---I'd have done it sooner!