No one is perfect, I had a couple of issues over the years, once I wired a 440 after a restoration and forgot the BB's spun the other way from SB's, another time I had the 4 wires from the dual ballast resistor switched thereby supplying only 6 volts to the coil instead of 10 or more, this made the alternator act wild too. The 440 that was on would barely start and run, it would backfire under acceleration and catch fire in the carb. I scratched my head for days on that because it acted like a serious vacuum leak in the manifold or a very lean jetting in the Holley. That engine was one that had alignment issues with the rotor and cap and pickup plate too. By the time I got all the bugs worked out of that setup I gained well over a 100 hp. It was always there just sleeping.
