von, I was also disappointed when the Comos were no longer available. We used the 51's in Miss Martha airplanes for funflies, and it was a great combination. They offered more bang for the buck than just about anything available in the 80's and early 90's. Thanks for sharing the "rest of the story" with us.
Re the ST MagV carb, I believe it was a major reason for the performance of my all time favorite pattern engine, the ST Bluehead. I still have a couple of those and when I occasionally use one of them it is very rarely that I need more than a single flip to start. In the heyday of "Classic Pattern" with its limited startup time that was an important performance attribute.