If you plan on reusing the crankshaft in the engine, I strongly suggest having it mag tested to make sure it's crack-free. Generally speaking, if a balancer isn't torqued properly (particularly to the point it breaks), it can't dampen harmonics correctly, which forces the crankshaft to dampen them. That can then lead to fatigue/cracks in the cheek area where the journals meet the counterweights over time.
I also see the "77" on your block. It it happens to be a 500557 casting, they have the thinner main saddles, which may have also been affected by having to absorb the harmonics. I'd suggest having it mag tested too for piece of mind.
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