Hi everyone. I am thinking about purchasing a 1990 SC, I have loved these cars ever since I saw my first one. The one I am thinking about getting the owner says it has a head gasket leak because it blows out white smoke. Is there a way to visually inspect it to see if it is a Head gasket or a cracked block. If it is a head gasket how hard is it to repair it myself, I am a weekend mechanic with a few tools. Thank you for the info.