This is the result of running rich, not a bad (or missing)cat.  Idle mixture should be set to produce around 1% CO BEFORE the cat (check the Bentley for the exact number)

A bad temperature sensor or oxygen sensor could cause rich running.

Transporter Werkes in Raleigh has a good reputation.

Bill
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Re: emissions inspection failed on 83

Check to see if your CAT. has been hollowed out.
                                     Eric

Marc wrote:

> Well, everything passed state inspection except emissions, which failed
> miserably.  Since I never had a mechanic look over the whole vehicle when I
> bought it, I'd like to take it somewhere that really knows these things to
> fix the emissions and do an overall inspection for me.  Can anyone
> recommend a place in/near Durham, NC?