Is Line Boring An Engine Block Necessary Or Should You Just Replace The Bearings

I recently got a engine block that looks great, 60k on it but I bought a new crankshaft, and upgraded engine parts. MY friend is telling me I don’t have to get the block line bored, but to just replace the bearings…is that going to be a problem? new pistons, rings, seals, and crankshaft…used block. Of course I will get the cylinders done but is the main bearing re-bore necessary????thx

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