All 318s and 5.2 Magnums are neutral balanced.
If you have a "one-size-fits-all" flywheel, the extra weight(s) should be left off. There are four different amounts of imbalance: largest for 360, next for the 5.9 Mag, next for cast crank 383s, 400s and 440s, and smallest for the heavy rod 440s.

R.