Pretty unlikely you'll clean it up with an air bleed mod , especialy if it's the 3 circuit , lots have been covered on here regarding modifications to these carbs , had the same problem with the 8896 , changed out the metering block gasket for a 4150 & restricted the IFRs with some wire , it'll never clean up so long as yer running tight lobe seps & long duration cams , spits out raw fuel @ overlap , tis the nature of the beast.