You need to identify the block code stamped on the front.
Such as WS .... YZ ..... XP .... etc
That alone makes big differences
Also reconfirm the casting dates you listed on block and heads , that is a huge gap between the dates you listed. And wouldn't be considered "matched" in a higher value perspective.
If you have all the ancillary pieces to complete the engine that will raise the value too.
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