Crank and balance

ok,

All this helps.

It is a 340 cast crank.

I have a stock harmonic balancer that reads "use with 340 cast crank only" that came off the engine when the rebuild started

.....I had the engine shop balance the crank and parts with a harmonic balancer that is not stock and does not read "use with 340...I guess my question now is do I need a new crank?