Are you sure the 82 LTD was a 351W and not a 302? I don't remember when thay changed the weights and which way they went on the 302's. I'll bet Torque King does though, might want to get up with him.
The weight of the balancers may be different but it is the imbalance weight that is important. The 351W uses a 28 oz as did the 302 through 76 I believe. The trucks sometimes had a wider balancer which made it heavier but also had more surface area on the rubber to provide better damping. For a fast reving motor you would want to the lighter/thinner balancer so the angular inertia would be less. For a torque motor the thicker balancer is better becuase it has more inertia.
Thanks for all the help. I actually only needed to replace the plate on the rear of the damper. After playing with it for a while I fund this was a seperate piece. It runs much better know that it's firing on all 8 cylinders instead of only six. Thanks again for the help.