727 on a magnum 360

i am putting a 727 on my 1995 magnum engine.
I understand I can use the stock flex plate and make one hole a little bigger, my question is..

what torque converter,
keep seeing a " neutral " weighted converter, ? what is a neutral weighted converter?
some say get a non weighted converted, some say this neutral thing?
my transmission builder says it needs a 91 gram weighted 130 tooth converter..

if someone could help me out on this..
what is correct..?
thanks