Balancing an engine

Just went through this with my Buick 3.8 Series II supercharged motor. The crank was out about 18 grams on one end, 22 grams out on the on the other. Would have spent the money anyways (to run the double-roller timing set you have to dump the balancer because it is run off the cam. It is in the lifter valley...), never have done a motor without doing it right.
Best core motor I ever bought? A 410 Mercury Super Marauder that had been in a flash flood. When we broke it down, Jaime and Larry found that the weights of every reciprocating part was within a gram of the others (pistons, rods) and the crank was balanced perfectly. It had obvious been gone through, but it is one torquey bastard!