Not sure what flexplate you have, but this is how I would go.
360 Harmonic Balancer.
B&M 360/727 Flexplate.
Neutral balanced torque converter. (no weights).
Keep it simple. :)
so can I use the flexplate that is currently on the 360, it is currently a 74 360 maited to a 904.
I am not sure if my 340/727 torque converter is nuetral or not. I dont remember seeing weights on it but its been a while.