Brian,
The really great engine makers are still around for the most part. And yes the Bluebird carbs were on a level with some of the early Magnums,. Magnum got it together.[&o] I base my observations on a smaller engine a friend had and several others owned by friends. As I remember the engine was a 25 or a 28, It would not shut down and was cranky at best when trying to tune. Does MDS mean anything to you....they went away for about the same reasons.