The engine # consists of casting #'s plus the consecutive stamping.
The casting bosses are above the starter and should be something like D2AE-CA and then a date stamp (e.g. 2K16 stamp = 1972 Nov 16th).
So full engine # should be something like D2AE-CA2K1606023
The consecutive engine # stamped at the factory is below the left head on the block as outlined in the photo. It is often a very light stamping and I had to remove all paint and sand the area and use a magnifying glass to be able to just determine what the numbers were. If you have a non original block then it may have no stamped numbers as this was a De Tomaso stamping.
I would also be willing to bet that 06023 is (or was) your factory engine and/or body servive # as it bears reasonable relation to your VIN (as it should). The coaches were pre-stamped with VIN's at Vignale, but then deliverd to Modena factory stock and they were not necessarily used in order so the body service # is record of the build sequence # of a particular car.
Julian
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