I might cry

Well it was supposed to be balanced and after talking with the builder there was a loss of communication whatever with the machine shop and it was just an externally balanced plain old 360. But because it was supposed to have been internally balanced because it was going in place of my 340. On the first start up it shook BAD so I put the weights in the harmonic balancer which cut it down a lot at that point they realised it wasn't balanced and sent me an SFI flexplate. which cured the vibration but that first trip with an untuned carb and it had power and after it was never the same. I've always wonder if something wasn't damaged by the vibration. It ran for 20mins at 2500rpm and then to the exhaust shop a few blocks away.

Hind sight being what it is I should have shut it down and started looking then but it sounded good and I was a bit excited being my first engine.