Wow, might be better to find a short block or another used engine and rebuild it. Some 955L's around being parted out.

any good engiine shop should be able to find you bearings to suit or bore weld and line bore the main journals back to size. generally the oversize is to allow for worn crank not spun bearings. its also possible to use devcon metal putties or similar to repair the bearing bodies.

first step is talk to a good engine reco shop first. it all comes down to how much money you want to spend just about anything can be repaired if your willing to spend the money.

as for pistons they may be recoverable. if new arent available via cat etc jp pistons can make them to suit just about any engine.

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Hello Rome
Going by the intake pipework and the exhaust risers, I think that is a D330.