5.9 Magnum to replace Older 360, flexplate?

stock 5.9 flexplates do not have the weight on them, they are still on the torque converter for the 5.9, but this is a different weight than the older LA 360 that you had before. The weight has to be in a specific spot.

So your best idea would be to knock the weight off of your converter and then buy that B&M flexplate. Then it will work without issue or headache.