I have run a flat kart version and seen them run near the front. they are made by mishue motorsports. if you google them they have a site.. don't know the number myself. what are you racing on asphault or dirt?
do you know if the track is relatively high bite? since no one else is saying anything I would say if its higher bite about 59-60 left 52-56 cross and 46-47 nose. if low bite try 55-57 left 48-52 cross and 48 nose. just a guess as I haven't run that exact kart just based off what I would plug into a champ kart.