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I think it would be a good investment if you got your hands on #1 which sold for 60K at B.J. or #427. Other than that you would be paying about 12K for a set of valve covers and a specially engraved engine plaque. IMO GM could have done so much more with that engine than they did.
Get a new ZL-1 block and build your own engine using real ZL-1 vintage parts.
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Thats what I would do. Get the block and do it right.