External balance flywheel ID

I removed this flywheel from an externally balanced '77 Volare with a 360 HP. However, in comparing it to pics of other 130 tooth flywheels for externally balanced 360's I did not see the characteristic three round shallow holes on the backside. It does have a series of drilled holes on the perimeter of the front side that none of my neutrally balanced flywheels have. Now unsure of what I have. No casting numbers or marks so maybe aftermarket? Can you help ID my flywheel ? See pics attached.

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