Newbie question about 318 balancing

Ok, I had my pistons, rods, and crank balanced when I built this engine (quite a while ago, this is a project that I am coming back to)

I get the feeling this is a stupid question, but here it goes.

Since it was internally balanced, do I need a harmonic balancer? If so, wouldnt it need to be different then how it was stock?

Thanks for helping the newb!

Cameron