Quite a few variables here, do you just wants something that works? If so, summit, JEGS, O'Reillys, etc. Which carb depends on the engine and what you want to do with it. Is it modified? AT or 4spd? cam, headers, etc.? If its relatively stock, throw a 600 CFM on it (which you can get from any of the previously mentioned locations). if it is modified and you are looking for max performance, well I will let others jump in once you publish some info.
If on the other hand you are trying to keep is stock or stock looking, then research what it came with and google that.
Whats wrong with what you have? Can't you just rebuild it? If Almost any of them can be rebuilt.
