I agree with Sub, it seems to me that a 4 barrel carb will be just way too much. Unless you go with a small 4 barrel and then install undersize jets, then besides show, what would you gain?
A carburetor is only one component, and that alone, will most likely not do much to improve performance.
Although it may speed up your trips to the gas pumps. Not to mention, probably foul up your spark plugs sooner, from burning too rich.
Thats just my opinion, but if you are determined to install a 4 barrel, they can normally be found, (or ordered), from your local auto parts, or high performance shop.
