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things like how long is a piece of string come to mind


big ends should have the crank measured and inspected for wear then if the crank is ok a standard bearing in the rod or if the crank needs to be ground down , a bearing to match the grind ( 10,20 or 30 thou under size )

the block would need measuring to find out what size it is over bored to when line bored and this would be to a standard over size shell back (again 10.20 or 30 thou oversize )
the bearing surface of the mains should be inspected at the same time and ground if needed to get the right finish (yet again 10,20 or 30 thou under size)
so you can have an oversize and undersize bearing on the outside and inside of the same shell
make sure you can get bearings to do this before you start as they may not be available or you may end up with a block that is only good as a boat anchor