For all of those interested, I removed the flywheels from both engines (I was putting an engine originally from an automatic car into a car with a manual tranny) and checked the balance on both of them. Both flywheels were indeed balanced neutrally. I finished putting the engine in yesterday and drove the car. There is not any vibration that I can sense. The fact that both flywheels were balanced neutrally may be good fortune on my part, but I guess there's no way of knowing for sure.
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