Looks like the only thing is a "C" ? Stamped on the front side. The paint looks like over spray.
The transmission has the partial throttle kick-down. If that helps.
As long as there are no visible welded weights,you should be good. I would take the time now,match the converter pilot hub & torque converter measurements, make sure they fit now. Not much luck on identifying stock converters,without a ATRA catalog.Post 2 is you're guy......