[Eagar1]

This question is really a matter of opinion, and experience. Just about any carb can work great if set up correctly. Holleys can run great if you go for an avenger type with the fuel bowl sights, and an aftermarket kit that allows you to adjust the jets with a turn of a screw. Eldebrocks also have been very strong runners, with the right tweeking. If you know what you are doing, a solid Quadrajet is actually one of the best for a mild 350, small primaries, and massive secondaries for real power/econo mix.
On a mild 350 I would recommend a Holley 670 Street avenger, then add the Adjust-A-Jet kit, for a totally tune-able set up. Get an O2 sensor and gauge set up, and you will be able to dial it in under all conditions, much like an EFI.
I agree on the dual plane, install a 1-inch spacer which will help with both power and the warpage issues.
I can't remember who, but someone makes a kit for the 700R4 that eliminates the pressure problems with the TV cable adjustment. It is installed in the valve body inside the pan, real easy.
Do not use a holley style (I forget the Model number) with the single fuel inlet and the pipe that sends fuel to the other bowl. They are tuff to tweek and are almost always underpowered. You can convert them to a double pumper type, but by the time you do you can just about buy a new one, unless you have other spare parts from old carbs to use.
Higher CFM carbs can be used successfully on smaller CI motors, but they require special tuning, and are usually used when turning higher than usual RPM, I actually had an 800cfm on a 327, but it was built to run over 6krpm.