torque converter balancing

on after market converter most of them arent balance for 360
but are neutral balance(340,318 etc)

to be able to balance them you can bring your flex plate to your
balancing shop so instead of balancing the converter they do it
on the flex plate or buy one already balance for a 360 like this one

http://www.summitracing.com/int/parts/bmm-10239/overview/make/plymouth