Customline3859 (David). John's suggestions of sleeving the two rust pitted cylinders OR boring the two cylinders for larger oversize piston are workable solutions that are used in the work-a-day world that will work.
I'm not sure of your circumstances OR of your goal with the vehicle that you're going to put the engine in.
Sleeving the cylinders in question or using oversize pistons are fixes that will make the engine use-able and work ready. I've disassembled engines that have had repairs of this type executed by quality machine shops.
All of the information shared is GooD. Gage what fits your intentions and finances.
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York