My truck started to die while going down the.

My truck started to die while going down the road after a few mins of driving. I changed the fuel filter, vacuum advance, cleanes the carb and put a new mechanical fuel pump on but it still won't run. I can crank it up with the choke out and it will idle but as soon as I give it gas or push the choke in it will still die. It has a holly 650 double pump carb and a 351m motor.