I personally love the old 3 barrel carbs. They still work just as good as they ever did. I have 3 of them and use them on the 60's Buick Nailhead. Yeah, I know, they are supposed to be too much carb for the Nailheads, but my Nailheads love them...good crisp response and lots of power and no multiple carbs to rebuild or complex linkage to hassle with.
I just wish Holley still had a rebuild kit for them. I have to cut gaskets etc. when I rebuild. And the secondary diaphragm is hard to come by...at least Holley should rebuild the diaphragms for people.