Accelerate and dies

[osaltyone]

I have this 49 with a 216, just replaced the fuel tank, lines, filter and a bunch of other stuff. It seems to idle great, but as soon as I touch the gas pedal it will die. When I first start it and have the choke all the way open I can hit the pedal no problem, but once the choke is off no dice. Any ideas? Accelerator plunger maybe? Carb was new a few years ago and truck hasn't been driven in 15-20yrs. It's been sitting in my in laws garage.