360 la weighted flex plate do I need to rebalance?

Hello guys, recently I had my crank balanced on my 360 la I had it balanced with an unweighted stock square style flex plate. Well come to find out the torque converter I ordered from PATC they forgot to put the butterfly weight on it, however I did order the proper torque converter for a 360la and I called and the guy said "well I wouldn't ever forget something like that". Sos here's my question should I have the crank re-balanced if I switch over to a b&m weighted flex plate or will I be okay running it the way the balanced it with the OEM flex plate?