My choice would be one of the new Edelbrock AFB carbs with the tuneable air valve...

I am currently running a 750cfm AFB on my mild 350.
Everyone said it would be too big...
I leaned it down with the strip kit and it works great.
I really do like the ability to pop the top off and switch stuff around without getting gas all over everything.
Only negative thing I can say about this carb is the strip kit. The print on the jet/rod chart is so small you need a magnifying glass to read it, and the jets and rods are stamped rather poorly and are hard to read. Other than that it is a great carb setup.
Put the electric choke kit on it too.

I had a 650 vacuum secondary Holley on it and it tried to burn the car to the ground after setting over the winter. The crossover tube o-ring got hard and it sprayed fuel all over when I started it first time in the spring... If a Holley is in the offering, I'd sure make sure it was a dual feed model.

Jeff