depends on how bad it really is!
you dont know for a fact that it is spun, which can be a good thing. What makes you think that it is spun? Could the noise that you hear be something different?
You will have to drop the oil pan off the engine and remove the each rod bearing cap and see if one of the bearings is messed up or spun.
Check the crank journals and have re machined or have the crank replaced if needed. while you are under there replace all your rod bearings you will be happy you did, once one goes that could mean more are going to go.
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