A 2 carb manifold with 2 smaller carbs, like the 1.5" bore Carter W-1s, or The Carter WAs like Hudson ran, is better for street use.
Read this:
http://www.thecarburetorshop.com/Dual1barrelcarbs.htmYOu'ld need to find some really small carbs to make a triple work on the street, and they don't really fit anyways, unless you want to modify the firewall.