Both mine have new catalytic converters too. When my Grandmother had the Bonneville it plugged up on her. Dad was just changing the Caprice as a maintenence thing. It doesnt seem like at least in my expeirience that check engines are much of a problem with these. The Bonneville will light once in the GREAT while if it is a mid idle but its rare. And you are right, mine too are for miles 117,00 for the Bonneville and 119,000 for the Caprice. Like you said enough use that they arent dryroted and that most of the things that go on these have been replaced. So they are good for a while again. Havent had to do anything with the carburetor with the Caprice, I think I can count on one had the times it ever stalled. The Bonneville is another story. Took 2 places and myself to get it rebuilt and running somewhat properly. I think there is a vacuum leak on that one but I have yet to really dig into it. People keep telling me I should get rid of the Bonneville since I now have the Caprice and the new Impala. I dont want to and if I do it someday it will be my choice not people telling me I have to. Again congrates on the car and I wish the 2 of you many trouble free miles of happy motoring.