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So, you are hearing noises from the engine some where. I have no idea how mechanically competent you are so I'll leave it at telling you about a motor that was in a car I imported from the US. The pistons had been knurled and bores parallel honed to recover from 0.006" wear in them. The gudgeons (wrist pins) had been very poorly redone with 0.005" O/S ones and new rings fitted. I wasn't happy with the noises emanating from under there so I decided to do something about it. The noises I was hearing came from the wrist pins. Are you sure yours is not the same? My advice would be to take it apart and carefully measure and check things
before deciding what to do.
BTW, the bottom end was loose too and I haven't been able to get it right yet.