I'll find out from Nick. He is the owner of the truck
All Pro balanced cranks received in stroker kits we get for engines are rebalanced. Had a FE Ford stroker out of balance over 120 grams. 3 grams is acceptable. Some cranks take a lot of weight in heavy metal slugs.
We had a 360 with an external balance front of the crank and a internal balanced rear of the crank. External Damper and a neutral flywheel on a 4 speed car. Unless you are standing at the balancer you can only take the word and trust the person balancing it. This 360 engine was balanced with the external 360 Damper used with the crank that was dropped off with the engine and no 360 flywheel .
So never trust your pro balanced crank . My small block would sin up over 9000 with steel mounts and it felt like and electric motor.
Here are 2 videos of the same molnar crank before and after balance. Look at the RPM difference once it is correctly balanced. Balancing is the most important from the damper to the tire.