Ok i know the best thing to do is have it rebalanced!i have a 400 engine and i was wondering if i put a 383 steel crank in it does it need to be rebalanced if i use the 383 flywheel and balancer? Just picking your brains!i'm going to but this in my 68 dart that had a 383 (threw a rod) and the price for the crank kit is the same so my flywheel and everything was for a internally balanced engine!but if the response is to get the cast crank and buy the balanced fly wheel thats probly what i will do!not going for max preformance just a daily driver!