Engine dies when I step on the gas

This happened to me as well, shortly after I got my '71 Valiant last summer. Turns out the Holley 1920 had a small crack near the accelerator pump. When you stepped on it, it would leak gas out the carb onto the intake manifold! With the gas not going into the engine, it obviously leaned out and wanted to die. So I got a Carter BBS and rebuilt it with good quality parts. Runs great now!