Like TechInspector stated, dial the fuel pressure back to 5-6 lbs. That is your major problem. Secondly, you have a mismatch of parts in the engine. Automatic transmissions and double pumper do not go well together unless you have a lot of stall speed. Compounding the problem is your intake manifold which is a single plane, and you should be running a dual plane if you want low end torque which most automatic transmissions need. Like others have suggested, fix the fuel pressure first, and then consider upgrading to a vacuum secondary carburetor and a dual plane intake like a Performer RPM. The difference in performance will be like night and day.