Save your money dude IMO any second hand carby that has "Intake has been smoothed with a dremal for more flow" written in the description is most likley being sold because it dosent work.
The description should probably read "carby has been modified by a teenager in the garage with dads dremel and dosent work so good anymore so I am flogging it and getting a new one"
lol ok cheers for the tip i am getting a IRK and there is this bloke near me that sels a whole head with DOHC and the lot not sure how much though will see.