Fuel Sending unit

I don't agree. More is not necessarily better. There is such a thing as too much. The fuel pump has to work harder to push (electric pump) or pull (mechanical pump) fuel through a bigger-diameter pipeline, and I don't like electric pumps on carbureted vehicles (discussion here). You say it yourself: the stock-size 5/16" unit will amply feed any but the most radically-built engines. Why futz around "solving" a deficiency that doesn't really exist?