Selecting the size and type (spreadbore or squarebore) of carburetor to fit your engine size and driving environment are more important than brand.

Re-read Bjorn's post as to working on carbs.

Ask three carb guys and you would probably receive three answers: alphabetically "Carter", "Holley", "Rochester". All have their advantages, all have their disadvantages.

There is another thread on this subject called "Carburetor replacement - advice" started by Barry that you might care to read.

Jon.