Some quotes on that cam you are using from the CP web site regarding no low end power:

"If it has 288 degrees duration at .050" lift. That is your problem. You need at least 3.90:1 rear gears with that cam. It has no cylinder pressure at low RPM. That means it has NO low end torque and you need the low gears to bring the RPM up quickly to get the engine in cam range. Simple as that."

"Launching at a higher RPM won't help much. It will fall flat on it's face a few yard out of the hole. You need lower gears to sustain the high RPM launch down track with a long duration cam."

"That's a fairly aggressive cam. It's a little hotter than a "744" cam and just slightly less crazy than the "041" cam. It probably won't have a ton of bottom end without Rhoads or other bleed-down hydraulic lifters. You might need to attend to the primary circuit of the carburetor and ensure that the fuel delivery curve is adequate for the low vacuum and low RPM you're seeing off the line."

First adavnce your initial timing to 12, give it a try and then 14 if you still see no improvement. If still not much of a change put the pump shot arm on the carb at the top hole. If still no good you will need the edel calibration kit to change out jets/ rods and step up spring. What stall converter do you have with the tranny? I think you are going to need at least a 2500 stall with that cam. It's a failrly radical cam that is designed for power in the high RPM range - so down low it's going to be low on power.