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Hello I will help you with your question,
The balance weight is included in case it is the one with the weight. If yours was running without vibration at idle then remove te weight and install it bare.
There are two engines, one with an internally balanced shaft and one that is externally balanced.
Please let me know how I can help
What flexplate came off it? One with a weight or one without?
I don't know the ins and outs of the engines but I could research it for you but the flexplates come with the weight. If you don't need it you remove it.
Let me know if the engine ran smooth with the original plate.