Glen if you need any more carbs contact the Alfa guy on e-bay. From memory hois e-bay seller name is something like Alfa1750. He has been in the game for ages with excellent feedback from other Z sites. He lives in Itally and has a huge assotion of parts and Dells & Webbers, (mainly Dells though). He overhauls and sets each set that go out. Serial numbers are matched very closely so all three are made roughly same time. From memory his real name is Gabriele. His a good bloke to deal with re time, thourough packaging and price. I paid $560 for carbs (3 x DHLA40's) delieverd to my door. They work greatwith float levels macthed, all new kits throughout and all screw adjustments and butterflies etc in very nice condition. It appears he replaces any screw that looks bad. Anyhow after paying that price it does still end up to about $1300 once you get the other bits but at least they are in overhauled condition and ready to go for years to come.
Good Luck!
Sulio