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The codes from both heads is 022 101 372 which would make them 2.0L heads with 37.5mm x 33mm valves. One head has a 51 stamped on it and the other has 54 but I'm not sure what those marks are for.
As for the case it is stamped GE052026 making it a 2.0L case from a 78-79 transporter
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