im going through the same thing with my 25 due to a melted ringland. im lucky as there was no marks on the bore, but im going to give it a light hone anyway, then install new pistons on #5 and 6, new rings on all pistons, new bearings, thermostat, water pump and oil pump.
hopefully it'll all run smoothly.
dont be suprised if i pm you with a few (read: alot) of questions.
thanks for the info. im sure it'll come in handy for alot of sau'ers.