My car will not get any gas to the engine.

I did a few things before trying to start the car. I put about a gallon and a half of gas in the car. I then tried to start the car, but no gas was going through the filter. Me and my dad were driving it just the other day, and all of a sudden it wasnt getting any gas. So here's what I tried. I decided to unplug the the lines running to the fuel pump and then I got back in the car and turned the key and gave it some gas to see if any gas was coming through at all. I then got out of the car to look on the ground for gas underneath the fuel lines and there was no gas at all on the ground. Its got a 400 big block put in it, a 433 rear end, and a racing cam also. Everything electrical works. Battery is runnin, but cant get any gas to come through. Is it clogged? Is it something else? Please help!