Originally Posted By krautrock
... 1.45 or 1.52 venturi with annular booster...

Annulars shouldn't be necessary on a carb with venturi that small.

Annular boosters are a bigger obstruction to air flow, which is why most successful applications using annulars that I've seen have been on 1.56" & larger venturi. All those small(er)-venturi annular carbs that Quick Fuel offers make no sense to me...