OK, you hang in there young man and ask questions about anything and everything. I think everyone on this board gets a kick out of helping a beginner get started in the right direction.
Cobalt told you that the carb size is not the problem and he is correct. You could run a 350 Chevy on a carb off a 5 horse Briggs & Stratton lawnmower motor without the motor snorting if push came to shove. You might not get it to a speed much above an idle without the airspeed through the carb exceeding its capability to mix fuel and air properly, but you get the idea. It's not the size of your carb that is giving you fits.
What delivery system is being used? What pump? What is the pressure of the fuel as it is delivered to the carb bowl? Have you set the floats according to trusted information? And adjusted the float drop also? What distributor are you using? When is the last time the cap and rotor were changed for new parts? Have you had the distributor apart to service the centrifugal weight pivots so the weight don't hang up? Have you disassembled the distributor to set the end gap on the shaft? The cam you're using will need a ton of initial timing at the crank. How much are you using at the crank? How much centrifugal are you using in the distributor? How about plug wires? How old? Have you run the motor at night in the dark with no light to look for spark scatter around the motor? Spark plugs? Have you researched and know positively that they are the correct heat range, gapped correctly and are the proper thread length for the cylinder heads you are using? There will be many more questions, but this is a start to get your cranial juices flowing.