That manifold is half the problem and those butterfly carbs never work right either. In addtion to the fuel discharge holes being off to one side of the carb bore, they are also on the short side of the intake you made and fuel drop out is a strong possibility. I don't see a transition area for the bore size to match port size.Most butterfly type carb have a large throttle bore that need to transition to the port size, the angle of the transition shouldn't be more than 6 degrees (included angle)
A better solution would be to shorten the stock manifold and use the WY, even though not ideal.