Testing fuel system

The new 360 Magnum I put in my '70 Duster seems to have a much bigger demand for fuel than my old worn-out 318 oddly enough... :D I think the carb bowls are running empty when I keep it floored for a while at higher RPM. Is there a way to test the fuel pump/system to make sure there isn't a flow problem? And if there is what would be the first things to check, I'm guessing fuel sender screen? New fuel filter BTW so I know it's not that...