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As stated above, a 10SI is all you need for your application. I would also consider using a small pulley on it to get the charge rate at idle that the alternator is capable of. A street flathead will never wind high enough to damage the alternator. You might have to tweak the alternator case to get the correct belt alignment with the slingshot bracket. The attached picture shows misalignment on an 8BA with truck water pumps. I can't find my "after" picture, but it is evident what needs to be trimmed.