There's an assumption that the OP is making that doesn't sound right to me.
On stock converters that have weights, like for a 340 cast crank or 360, the weights are welded to the OD of the converter shell. But the OP has mentioned twice now that the weights would be welded to the flat area above the mounting bolt.
Is this common?
I am not that familiar with aftermarket converters and want to know.

R.