The o-ring was one of the first things i did before puting on the carb. As for my air filter i have a short compact one similar to this
i do have a screen pack im not using but i can easily pop that in behind the airfilter. Is the short filter okay? If not i might as well ditch it and grab a foam one as you said and if thats the case which would you recommend?
As for the boost holes, which number slide would be best for trying to add them to? Could i do that to the plastic one?