This problem seems to be getting worse and not sure where to start first. When I accelerate hard the motor loses power/hesitates but if I go easy there is no problem. Even when I'm not moving, just idling and hit the pedal hard there is a noticeable hesitation. I have new wires, plugs, accel ignition coil, holley fuel pump, fuel filter, points, cap & rotor; around 100 miles on these parts. This spring installed 268 cam, lifters, 2.02 summit heads, timing chain, edelbrock performer mani & used quadrajet which appears to be in good shape but I am now wondering. My timing is set at 12 degrees, starts fine. After a few days of sitting I have to pump the pedal quite a bit, but assume that's from the carb gas evaporating. I've pulled some of the plugs and they have some carbon build up on them but don't think that's the problem. My first instinct tells me it's not getting enough gas. What do you guys think and how and where should I start first. Oh yeah, I also replaced the entire fuel line from tank to carb. All advice welcome, thanks.