I have a 70 Roadrunner 440/6 w/4 speed and 4.10 gears. When l really get on it, the motor bogs and there is a slight hesitation. After a second or two of this, the motor seems to get caught up and runs like hell. I have checked the timing and set it to 12.5 btdc. The holley carbs are new with an Eldelbrock aluminum manifold, E Street aluminum heads and a little hotter than stock cam. Also Mopar electronic ignition, new Accel wires and new Champion RC12YC plugs. Any thoughts? Thanks.