OK, you need to order .010" undersize bearings if you choose to replace them. It's not a particularly difficult process. Simply remove the main caps one at a time, and loosen all the others a couple of turns to let the crankshaft drop down a little. Then bend a cotter pin into a T shape that will slip into the oil hole in the crankshaft journal with the cross piece of the T lying flat against the shaft. It won't be a perfect 90 degree angle since the oil passages are drilled to point toward the rod journals. Roll the crank against the bearing shell and keep turning to push the bearing out of the block. Be sure to push the anti-rotate tab out of the block, not force in tighter! Roll the new bearing into the block the same way.
I'd suggest checking the oil clearance with Plastigauge, using the bearings you have in there now. Pay particular attention to the front to rear clearance, as the bearing in your picture appears to have more clearance at one end than the other. That's not a good thing! The only way to correct a tapered crankshaft journal is to regrind it to the next smaller undersize, .020". That requires a complete engine disassembly.
Jerry
