Steve. If there is suspicion of the crankshaft I agree with Gareth that it should be inspected as soon as practicable, because the state of this shaft and its bearings will have a huge influence on the cost of the repair, or even the feasability of repairing it at all. Regrinding of crankshafts was common years ago, along with fitting undersize main and big end bearing shells. I do not know if this sort of work is done commercially any more. Perhaps there are classic car restorers who do, but are undersize shells still available?
If you can post high resolution pictures of the bearing shells and crankshaft journals we can get an initial idea of their condition and advise further.