flywheel and balance

[AMiller]

Forgive my lack of knowledge here but I am wondering just what I need.

I have a 351w that has been rebuilt and balanced before assembly. Do I still need a 28oz. balance on the flywheel or do I go to a 0 balance fly?

I ask this because I was looking at an aluminum fly and they wanted me to specify what balance, 28 or 50 so they could include the weights. Then I saw another aluminum fly for a zero balance. With a balanced rotating assembly do I go with a zero balance flywheel or stay with a 28oz?

Thanks
Aaron