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You may want to start with some simple diagnostics. By installing your carburetor on his car you have probably eliminated the carburetor as the cause of the problem.
1. Is timing set correctly ? If too retarded, power will be affected.
2. Check compression. Remove all the plugs. Turn off the gas, and check with throttle lever pulled all the way down (Open Throttle)
3. Insure there are no intake manifold leaks.