Questionable decisions!

Once you get that weight off using the procedure Steve mentioned above, lay the flex plate from the 5.2 up against the converter to match the holes up. You will see that you have to oval one hole out to fit. If you aren't using the fuel injection that came on the 5.2, you may be able to use the flex plate from an LA motor, that matches that converter. If it were a 5.9 Magnum, you'd be stuck using the 5.9 Magnum flex plate because they are external balanced and the weight is on the flex plate vs being on the converter like yours is.