International scout 1980 turbo diesel with ac

This is a 1980 turbo diesel dana 300 transfer case 4spd with a/cbody is straight doors do shut nice previous owner has done some body work and is so so good but looks like very little bondo inside is nice could use a cleaning the paint sucks thoughfloors were replaced at some point looks a little rednecked but could be dressed upnew tires good years I also have the hub capsI did have it saftey inspected and passed finenow for the bad it does have blow by it will start and run but #5 cylinder is failed deadthere is no knocking rattling or anything I woud assume stuck or fused ring or possibly hole in piston I have only started a few times as not to damage itI am a diesel and heavy equipment mechanic so I do know what im talking about this is not a hard fix as all other cyl are firing fineI have done s out for many years I just dont have time for this one right now reason for the sale.