Not a mind reader, but looked up your previous thread. Ether for starting likely says it all. As JS says measure everything before deciding. I reckon you will find top rings are shot, likely the ring grooves in need of renovation and furthermore, possibly not the size of piston/liner you might expect to find.
Don't know what you mean by 'compression on the oil and main rings'.
As Duane says, you need a workshop manual. I am thinking you will need more than that.