vibration in new engine

[cop-coupe]

I thought all post 87 cranks were 50 oz balanced. The rotating assembly was not balanced together. I bought the short block from a builder in Indy, then finished it off with my parts. The only thing I did not take into consideration was the converter. It came with the trany. Is it possible to have the converter balanced seperately, I know this probably would not be ideal for your application but for just a hobby car for shows and occasional strip time would this be sufficient