Unless the crank has gone through balancing with aftermarket parts being used - the factory balance job is fine.

The plants ran all the rods and pistons as is - the supplier was supposed to keep them between a min/max spec for weight.

The cranks were all balanced after grinding using the factory bob weight specs.
Then they went to assembly.

My suggestion is look the crank over real good and see if it has what appears to be drilling’s that look unusual to the crank - real clean/shiny metal compared to surrounding metal, etc. if not then put it together.

I believe the older service manual should show puston, pin and rod weights so you can check your internals yourself with a gram scale.

Unless you are spinning it to the moon you will be good.