The rings were pretty much baked.
Yeah, know what you mean.
I had a rat build a nest inside the cooling tin.
Trip down to creek was a breeze.
Trip back up hill was a struggle and it seized and died.
Luckily it was a heat seize and not a lean seize and turned over after it cooled a little while.
Top two rings were stuck to piston and oil rings were sticky.
I did do crank bearings also.
Everything else was in spec when I measured them so I bought parts and put it back together.
When you have bottom end out, you might look at the babbit on the large end of the counterweight rods and check play.
Mine was worn enough to make a little tink-tink-tink noise while under load.
Also measure the rod that comes up thru bottom that counterweight slides on - mine was worn a little so I replaced it.
Also use a good modern engine assembly lube when assembling parts.