If the car has a low end power problem, you need to find out what the specs are on the camshaft. It could be too big for what you are trying to do with the car. Have you checked the total ignition timing? The shop that installed and set up the engine my have the total ignition timing retarded too far. What power valve is in this carb? If your idle vacuum is about 7.0 and you have a 10.5 power valve in the carb, the power valve will be dumping fuel into the engine all the time. An engine with a big camshaft will generally have low idle vacuum. Install a vacuum gauge on the engine and see what your idle vacuum is.
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