If you haven't given it a first-stage clean-out before those pictures, it is remarkably clean. Some pictures of the big end bearing in the connecting rod would be useful, to see how the lubrication has held up, but the most important information is the piston ring gaps. These are measured by removing the rings from the piston, inserting them one at a time in the top of the bore, and pushing them down 1 cm from the top, using the top of the piston to keep them square to the bore (otherwise the gap doesn't mean anything). The gap can normally be measured with feeler gauges.
The service limit for the gaps, for all rings, is 0.039" (1.0 mm). However rings in good condition should be about half that. For new rings in a new bore, the top two rings should have gaps of 0.008- 0.016", and the oil rings, gaps of 0.006- 0.014".
I can't see the oil ring well enough to interpret whether it is a one piece cast iron ring (early production) or two steel rail rings with a separate expander (late production).
