Hitting a flat spot

Okay totally frustrated at this point, I have .60 360 complete rebuild stock heads comp cam xe268 with stock distributor and weiand dual plane high rise manifold and edelbrock 650 avs run good temp but at times I go to accelarate and it sputters like a fuel lock issue...anyone have any idea, wires plug everything is new cap rotor everyone just can't get this figure out, and it not all the time