cast crank is ok for stock. if you're after performance, you've got that big, ugly,heavy balancer.little stall converter availability /special offset flexplate to buy. balance job will cost more and you've got a externally balanced engine vs internally [the right way] btw,the only cast crank iv'e seen broke was a dodge camper special 400 when I wrenched in the airforce. it broke right in the middle of #3 main but was still running with a knock.it drove in the shop! i'm sure it took a lot of abuse.