"Have never seen 'wear'
"Have never seen 'wear' in an outboard cylinder making it needed to re-size!
The measurements that you may be after are all in the OEM work shop manual, but most likely of little help in your case.
The comp reading indicates no big problems ABOVE pistons.
My guess is that your problem is more related to cranck case leakage either between cylinders (middle crank shaft 'sealing' or upper/lower crank shaft seals.
Unless scored cyls, which I doubt, the solution in your case might just be a compl engine re-seal kit, a new center cranck shaft bearing and a new set of piston rings. They may have lost tension over the years, but will probably measure out to specs!
Start by getting an OEM manual for yor engine."