Thanks to the advice from the list I installed a new cat, changed the
oil and put in a higher octane fuel. I don't know which things altered
which readings except of course the NO reading. The honeycomb inside the
old cat had completely disintegrated.

 

Here are the first (fail) readings and the new (pass) readings. 

 

            Before               After                 Limit

            

HC        48                     10                     127

CO       .5                     .1                     .81

NO       1963                 202                   882