No spark

OK, we got the new engine in my sons 73 Swinger (complete rebuild of a 318) and have replaced all of the eletronic components except the distributor. We have power to the coil but no spark. We replaced the 5 pin electronic ignition module, the voltage regulator, the coil, new spark plug wires, cap, rotor, the whole shebang. Not real sure why there is no spark.....is there something I'm missing here? Any here would be greatly appreciated. Thanx, Kevin