360 crankshaft end play

I would catch it right away before the thrust surfaces of your bearing/block start getting galled up. If you are lucky, the thrust bearing has taken most of the wear and you could change it and fix your converter if that is the root cause of the problem.

If you keep running it, you may start gouging the block surface behind the thrust bearing after the thrust bearing is all gone, then you may need a new block... Catch it now and see if you can save the block.