Advice on a 625 CFM STREET DEMON CARBURETOR for 273 commando

ok good info. i think that monster 800 cfm is mechanical secondaries. like i said at full out its awesome but putting around seems to stumble. i'm not going to road race this thing, not after a 7 year restore. thanks for the info i just wanted to make sure i wasn't missing anything going with the demon due to it being a little more unconventional. i like all the new improvements it has so i think ill go with it brand new verses used or reman then ill get a true view of it. thanks