I spent 30+ years teaching auto mechanics, including catalytic converter theory and operation, and the chemistry involved in the process. Of course I'm correct. The 72 Mazda RX-2 I bought brand new had a cat- - - -for about three weeks until I broke it in half during a hill climb on Okinawa.
Jerry
To be clear, you were incorrect about everything I quoted in my reply except the general description of how fuel control is performed with an O2 sensor to optimize catalytic converter performance for emissions reduction. You even came up with another example of a traditional carb/converter application from 1972 that didn't have this type of fuel control. If you just don't like the idea of putting a CC on a Stovebolt, that's fine. However, we shouldn't be making things up to influence someone else's decision. Stick with the facts and let people decide for themselves.
I'd agree with the general consensus that you want the engine and components tuned as well as possible to see if you can mitigate the smelly exhaust first. As mentioned earlier, if things are way out of whack with your fuel delivery and combustion, the converter not only won't help but will likely cause more problems.
If you still want to try something, Rockauto shows a replacement CC for 1978 250ci truck (Walker PN :15501) that doesn't appear to have any flanges. Looks like it could be clamped in place just like a muffler. Again, you'd want to locate this closer to the engine and have some heat shielding installed. Otherwise, it looks like it would be the least intrusive to try and easiest to uninstall if it didn't work out?
