Magnum balance....

Pulled a Magnum motor from an 01 RAM, and I'm dropping it in a Demon that currently has a 340 and a 727. I plan on running the serpentine setup, so the stock style one piece balancer is fine. It is an external balance balancer. The flexplate on this Magnum has no weights on it, and I assume the torque converter on this particular truck the motor was pulled from has weights. I don't have the converter, and want to use the zero balanced converter I currently have behind the 340 in the 727. Does anyone which weighted flex plate I need to use so I can avoid balancing and adding weight to my converter? I've read lots of posts and I am still scratching my head over options.