Try spraying the area with a universal lubricant/Stoddard solvent like WD-40 and then use a light source angled from the side. the lubricant should flow-into the engravings and the lateral light source should help you to be able to see the engravings. If your bike's paint is really badly-oxidized (that whitish deposit) try a Scotchbrite pad with the universal lubricant/Stoddard solvent to remove the heavy encrustation of oxidation. Wipe it all-clean, and then try the WD-40/lateral lighting.
In this type of circumstance, one way to approach it is to use plastigage to measure your clearances, and then to see where you need to-be for needed clearances. It might be extra work, but it's just time. Replace all the shells wherever, if you aren't sure where they belong, see if once everything is torqued-down, you can manually rotate the crank, you should if you have sufficient clearances. Then you can disassemble it again, and mark the shells as to their locations, and use the plastigage to measure clearances. Yes, that means you need to reassemble the case halves, again. That should get you to be able to order what you need.
If the engine won't turn-over manually, you have an interference and need to start swapping shells and locations on the crank to be able to turn-over the engine manually. Keep a log of what shells are where, to try and get them so the crank turns easily. Once it does, then you can use the plastigage.
