Not to rain on your parade, but there are things you need to consider when using motorcycle carbs for an engine that has a fuel pump. Most motorcycle carbs are gravity feed, and wont handle fuel pump pressures over maybe 2 lbs. at the most. They also don't have accelerator pumps, so getting past idle will be an issue with most.
If you look around at some cycle shops, or motorcycle salvage yards you can find a few carbs that are mounted on bikes that use both fuel pumps, and accelerator pumps. The older Honda Goldwings had the tank mounted below carbs, so they used a fuel pump, and would be a good choice for this project. They used 4 per engine, so you'll need to find a couple bikes to get 6 carbs.
There are also carb kits available for these older carbs to cheaply and easily rebuild them, so getting old ones running is not a problem. Saber Cycle sells a kit for all 4 carbs for under $50.