Take the fuel line loose at the pump, jack the car up on the drivers side to where the front line is lower than the fuel tank. Fuel should gush out of the line if it is not blocked. The line should be primed for the pump to pull fuel up to he carb. If it don't pump from here get ready to change a pump.

56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d