Rebuilt Engine bearing wear

Hello all. My freshly rebuilt magnum 360 was making a strange ticking type noise. I decided to play it safe and drop the pan to check the bearings. Well they don't look great. I only checked 4 tonight and I didn't like any of them. Crank was polished and all bearings were plastigaged. Any help here? Crank still looks perfect from what I've seen. Just the bearings seem beat. I have new rod bearings already but how do you replace the mains in the engine? I've heard some people do it. I'm talking to the machine shop tomorrow morning. 20220520_204333.jpg 20220520_212024.jpg

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