I don't know were you guys come up with the idea that the monjet carb is a better carb then the B personally I would go with a B carb.
I have talked to several old machanics who worked on Gm vehicles 30 years ago and they all say that the monojet carb has far more problems then the b carbs.
The only problems with the B carbs is that they can leak out the sides but there are whys to deal with that issue, there simpler carbs and been around since 1937 longer then monojets.