converter?

At this point, "I" would remove the weights from the converter and use the flex plate that's correct for the ENGINE you're going to use. Mainly because of this statement in your first post: "i have a 727 from a 340 car i believe"

See that word at the end? "Believe" tells me you're not SURE which converter it is. So, rather than take a chance on doing it TWICE, knock the weights off the converter and use the B&M flex plate that's correct for the engine.