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Update:
I contacted the library in Des Moines and this is the e-mail I received back:

Hi Paul,

The only Chevrolet dealers I find in the Des Moines phonebook and city directory in 1971 are:

Bob Brown Chevrolet 4224 Merle Hay Road
Crescent Chevrolet 555 17th Street
Howlett Chevrolet 623 East Grand Avenue

There has been a Chevrolet dealer in Davenport since the 1950s called Lujack Chevrolet, if that's any help.


Burke
Des Moines Public Library

Now I would have bet anything Lujack was the answer but speaking to Lujack, they have always been in Davenport and their reported zone and code are: 11 387 and 47 388 although their name fit the bill perfectly. I guess the searc goes on.
Aslo checked all of the above dealers and they each are listed in the NCRS with codes that did not match.
Paul