Re: Excessive crank end float.
It is not going to last very long with that much clearance. You need to determine what the problem is first.
Is the thrust bearing worn? If so, possibly a new one will cure the problem.
Is the block saddle worn? If so, sleeving the side of the saddle will cure that.
Is the crank thrust worn? If so, it can be welded and re- ground.
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