I might be missing something in your post but, If you have a 89 motor it should have a 50oz Harmonic Balancer & flexplate. Unless it was somehow changed when the motor was built?
Pre-1980 motors used 28.2 oz Balancer and flexplate.
Either way the balancer is keyed, to only fit one way on the crank. ( For dummies like me)
If a 28.2 oz was bolted onto a late model 5.0 it should have gave a good vibration. Maybe thats why your balancer came apart?
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