best 2bbl carb for /6 225 super six manifold.

Bewy said
Get a Weber carb, they are the best 2bbls

…if you want to have to figure out an air cleaner arrangement that both fits and actually keeps grit out of your engine…and figure out a throttle linkage…and a choke linkage…and a kickdown linkage all from scratch…and spend your life tweaking and tuning and fiddlefutzing with jets and tubes and stuff, trying to make it run all the way right, then yeah, a Weber is definitely your best pick.

Otherwise, there are better options. Drop-ons include various Carter BBDs (real ones, not the Chinese "100% New-new-new-OMG-new!" knockoffs all over the web), Holley 2280s, and Bendix Stromberg WWs.

The Motorcraft 2100/2150 needs an adapter plate, but is well worthwhile; read this and this (and follow the links in those links).