 
I found an old gasket kit made by Victor (now Dana):
The applications include Nash 40 1956, Rambler 10 1956-63, and Rambler 01 (American) 1958-63:
The actual head gasket I have is newer:
The Victor number, 1119, still matches the kit:
There aren't any extra holes. This gasket looks like a very exact match:
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