OK, the owner has confirmed the number (no pic) to be 48Z111695 as Buford26 surmised. Does that sequential number correspond to the car VIN, or is it merely an engine production sequential? Going by the day code (322) and the range, whether it's car or engine production, it seems to me that would be a late year build, nearly into the '69 model year. Agree?
None of this adds weight to the theory that it's being some sort of an experimental installation. If it corresponds to a car VIN, that pretty much kills it. If an engine sequential, the date works against it. If it was part of an experiment with a 4-barrel engine...unlikely to have been done on a '66 vehicle... they would most likely have used a current production 1414D or 1414X (1414D Super Wagoneer or 1414X Custom Special... and the Super Wagoneer variant was on it's way out at this point replaced with the similar-but-downgraded Custom Special), and since they were already buying engines from Buick, they would likely have just bought a new engine from Buick, probably one with a replacement number on it. Or it would have been marked in some other way for KJC.
Again, all you Buick "Nailheads" ( : < ), many thanks for taking the time and effort to help me with this!
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