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I was told when I bought my 1965 convertible that it had a 1967 327 in it.
The casting number is 3892657, which as far as I can tell is consistent with that. But it looks like that casting number may also be consistent with a 1967 302 and a 350.
The stamp pad is blank. I think that means it is likely a replacement block.
Short of disassembling the engine and measuring things, is there a way to tell the displacement and HP?