In order to know what carburetor you should use, we need to know more about your engine.
Compression ratio?
Cam specifics?
What is the max rpm you want to reach?
Carburetors are very misunderstood. Putting on a larger carb will NOT always give you more power. Bigger is not better. The carburetor only feeds the engine. If the engine can not handle more air/fuel, then a bigger carb is pointless.
There is the formula to calculate the correct size carburetor for your car. It looks complicated, but it is actually very simple. Substitute the correct values for your car into the formula below:
(A * B * C * 0.0005787) / 2 = carburetor size.
A = Engine displacement in cubic inches
B = The max RPM you want to reach
C = volumetric efficiency of your engine (as a decimal).
Example:
A = 350
B = 5,500
C = 100%
(350 * 5500 * 1 * 0.0005787) / 2 = 556.99875
A 350 cid that is running at 5500 rpm's can AT MOST process 557 cubic feet of air per minute.