81 and older use the 28oz balance maybe 82, I forgot. 351's I believe use the 28 balance, as well as 331/347 strokers. If you're building a run of the mill 5.0 engine, you've got the wrong stuff, and need to get a 50 oz balance setup.
Sorry I should have said in the first post. I am building a 347 and it was recommended to run a 28oz imbalance. I was just wondering if a 28oz balancer and a 28.2oz flywheel are going to be the same?