1996 Honda Civic piston ring clearance

a friend replaced the engine of his 1999 civic after blowing his old engine.instead of throwing away, i offered to buy it for a very small amount thinking i could get some undamaged and useful parts. i disassembled the engine and found the only obvious damage was the no.3 crankshaft bearing and the shaft. the rest looks ok except a little grinding of the valves and seats. im not sure about the piston rings if its a good idea to use it on my car when its my time to make an overhaul.I was told the old engine was doing 125mph when it blew,so i guess compression was still good, i need some advice and info about the clearance of piston rings. .tnx.